At work we have to share lunchroom with people from another office on the same floor, and this addition provides for a really good time during those lunch breaks. Our own administration is just five persons, so having the possibility to mix with a bigger group is a very welcome thing indeed.
A month or so ago we've developed this new lunch time attraction, which is solving crosswords in newspapers. While solving crossword by yourself is just a challenge for one's knowledge, a collective solving makes the whole thing a laugh out loud hit. Anybody know the right word? No? Then let's just make one up! You'd never believe how bizarre and hilarious it could be, when all the people in the room are making their best to provide the answer or to make one up.
Some made up words should be patented or at least framed and hung on the walls so great they are :D