My favorite office events were the ones that only the engineers would organize at an A&E firm I once worked at. We'd take a fishing charter out in the morning and drink beer and troll for tuna, wahoo and marlin for half a day, then come back on shore around noon and spend the rest of the afternoon cooking up what we caught and drinking even more beer.
Current job, not so exciting - huge events with our 800 + employees, no alcohol, but lots of raffle prizes and "enforced fun".