I think I've had this dream before...

There's some sort of school trip to some kind of museum, a modern museum with a load of industrial exhibits outside. I'm my normal age (18) and perhaps in charge, somewhat. We go inside, and I see a open door I go through to see this running engine. I talk with the man tending it, and am interrupted by a pair of children fighting. We break it up, and the children pour salt into the sugar (or was it toffees?) and it turns red. He berates the children...

The scene changes, we are in the same place, and we are ushered into a small room. There are large blunt spikes in the floor made out of temporary fencing posts... Most people have already found spaces, and I am forced to sit in the central rectangle with the man in charge. He hands people some bits of rope, telling them to untie them and then re-tie them. I expect to get the same, but get two thin pieces of wood with hazard stripes painted onto them. I accidently break one (it has the consistency of plasterboard) and hide the fact while he tells me to make a I and a S with them. I realise that by putting them together like this:

           ##################
           #                #
#############################
#                # 
################## 
it'll make a S, and looking at them narrow on they'll look like an I. But I wake up as I've thought too much - that always happens, just before the telephone rings from Crucial to say they can't accept my debit card. And it's not even 8:30 yet.