For the uneducated, you can find out more about NetMeeting here. Here's a few quick ideas to get you started. You'll probably come up with a good few more.
A good way to have fun with NetMeeting is not to pester random people across copper wire, but to use the handy-dandy ultra fast LAN used to connect the computers in your school/college/place of work. It's a lot easier to use NetMeeting on a LAN because all you need to do is type the name of the machine you want to connect to rather than use a directory server which doesn't work half the time. Here's some fun stuff to do with NetMeeting on the LAN:
1. Scare people
Get a bunch of you to start chatting, and wait for somebody to say something which could incriminate themselves. At my school, this doesn't take too long, since people normally type things like "drewgaydrewgaydrewgay" or (I swear I'm not making this up) "ravage me like the nun you are" in private messages. Collect these little titbits and don't exit the chat window (or your hard earned evidence will fly away). Save the file, and send a private to tell them you have some bad, bad stuff on them. Initiate a file transfer to them and send them the evidence. Type stuff in the channel like "I'm gonna totally get Rhys fucked over by emailing this to an administrator.". They should grovel, and may even disconnect and reconnect through you to appease you.1 It's wonderfully immature, but very funny if done correctly. Sometimes people are dumb enough to say stupid things over and over again.
1 The significance of this is that if somebody connects to the network through you, you actually have the power to disconnect them if they annoy you. By giving you this power, people are effectively paying tribute to you to calm you down. It also means that you can taunt them by threatening to disconnect them if they annoy you.
2. Taunt everyone else
When you get the power to disconnect (and when you know that no one else can disconnect you), torture the other people in the channel by announcing that you are going to disconnect a person at random. It's not that bad, but it's annoying for whoever gets booted. People may start kissing up to you. Or they may say what a wanker you are. Hopefully the former. Pick the person who's been annoying you the most and kick them. Repeat.
NB: Make sure there's at least three or four other people, or this can get quite predictable with not enough of a "Russian Roulette" element to it.
3. Play Pictionary
Over a LAN, the whiteboard is actually updated frequently enough for you to play a game of Pictionary. For the unfamiliar, this is a game where one person draws something and the others compete to guess what it is first. Sounds easy, but it's not. The challenge is intensified when you take into account the fact that just about no one can draw freehand using a mouse. This can lead to interesting results:
Rhys starts to draw.
TSM: Its a stickman
DrT: no its a book
TSM: it's a radiator
DrT: chicken
DrT: a farm animal, isnt it?
DrT: duck
DrT: duck
DrT: du
DrT: ck
DrT: rooster
TSM: physics textbook
Rhys: almost
DrT: it's a cok
TSM: it's me
Rhys: a COK?
By this point it is obvious that it's a drawing of a person, despite Rhys' poor drawing skills.
DrT: its a frenchman cuz it has
DrT: a beret
DrT: aint
TSM: i know what it is
DrT: it?
TSM: it's your mum!
DrT: /me tries to stop himself from bursting out laughing
Rhys: f** k off matt
DrT: is it matt?
Rhys: Congratulations, DREW IS CORRECT
TSM: it's a pen
DrT: YAY I RULE J00 477 5UX0R
DrT: nya nya ntya
Rhys: actually i was just kidding
TSM: HA
DrT: what
DrT: Why you BIG PIECE OF
The point is, you can have a good laugh at each other by doing this. And everyone knows that laughter is good for you.
4. Use NetMeeting for its intented purpose
We do this sometimes. For example, some of the 30 or so of us had to do a design homework which involved designing a desk tidy using CAD software. Some of us were completely stumped, had no idea what to do, and knew that if they didn't do it, they'd be dead meat on a stick. Solution? We just held a NetMeeting and used the features to their full ability. We used file transfer to transfer the CAD files, used chat to explain how to use them, and used the whiteboard to draw what they looked like (roughly). This can be just as much fun as abusing the program and using it to send snide messages about people you dislike.
5. The "Don't Let Them Disconnect" Game
Simple. When a person wants to leave you (unbelievable, I know, but it happens) and you don't want them to go, just keep sending them private messages of gibberish. Each time one of your packets of gibberish hits them, the chat window should hopefully leap to the front of their screen. This should have the effect of preventing them from leaving. Flood them like this:
(10:36:03) DrT (private): dfasd
(10:36:03) DrT (private): d
(10:36:04) DrT (private): f
(10:36:04) DrT (private): asd
You get the idea. Remember that if someone does this to you, you need to quickly hang up. Or use the three fingered salute to kill it. Or just hit the off switch if that doesn't work.
6. Guess who I am/what animal I am/what number I'm thinking of.
Pretty self explanatory. Just use chat to get one of you to pick a number between 0 and 100, describe someone (in a highly derogatory way, of course) or make an animal noise. These can be a lot funnier (especially the animal game) if everyone participating has a microphone and speakers. Unfortunately, we don't, but I can easily imagine a crazy free-for-all as everyone starts screaming guesses.