I've been fascinated by invisibility lately. Here are the advantages in no particular order:

• running around naked
• peeping tom
• absolute power
• life of the party
• save money on a Halloween costume
• save money on clothes (see above)
• be a kid's real imaginary friend (Think about it. real imaginary...)

• you'd get damn cold in the winter - an invisible cold pee-pee is still a small pee-pee
  
• you'd probably make some noise and get caught peeping after being out in the cold and then catching one
  
• how are you going to rule if people cannot see you?
  
• people won't even know you're at the party. Big bummer if you're the stripper.
  
• you'd be hunted like Frankenstein the rest of your life
  
• save money on clothes? How about the doctor bill you'll get after catching a cold.
  
• eventually the kid will forget about you and you'll cease to exist