Basically you suggest a random object/place and make a suggestive comment (just like the board game that's hilarious to play when you're smashed. and yes i am that bored!

e.g. if I said the Eifel Tower (to choose a random example!) the person below me could say something like:

takes an age to get up

Hopefully we'll have some better one's than that!

Ill start with...

rock