Hanging Bats is fun for all the spectators.
One issues a challenge that you will buy beer for anyone who can outhang you on an upended mess table.
To start you lie face down on the table and have it slowly raised to the vertical by some mates whilst hanging by your feet....... after a suitable time you release amid groans and curses of "he'll never do it". The victim, suitably wound up by his mates pushes to the front and accepts the challenge, lies face down and is upended. At this stage as he is straining away pour a pint of beer down each trouser leg and retire to a safe distance.
Good for chuckles!
Once abseiled into the mess bar at Honington through the window (open) and was going back for a second go when someone who forgot to attach himself to the rope plummeted to the ground (it's okay the flowerbed broke his fall).
And there is of course bungy running. Get a climbing harness, an appropriate length of bungy cord (1234 99 something). Attach to a firm point in the mess, radiator or doorway etc and see who can place a beermat the furthest into the room before being whisked backwards to collide with something hard and break your arm (FIADGE '94 ISTR) or acquire some interesting carpet burns to the face (you know who you are).
This game was stopped by the PMC in the FI in 94 because of the high attrition rate one night. 2 x broken arms, 1 x serious concussion, 3 x splendid headwounds and assorted carpet burns, oh, and the loose radiator......
