If your stn houses more than one sqn, my favourite would be canadian-style table sawing.
Instructions:
1. Go to Nutts Corner market and buy an old officers' mess-style dining table for a fiver or go to B&Q and buy some marine ply, 2x2 and Ronseal dark mahogany varnish and construct an officers' mess-style dining table.
2. When the dining-in is set up, remove a real table from where your sqn officers are sitting and replace it with your construction.
3. After the high heid-yins have retired to the bar, challenge other sqn(s) to table sawing competition offering bottle of champers to the fastest, and proceed to saw your table in half.
4. Taunt other sqn(s) as wooses until they do the same to theirs.
5. Whether you win or lose, the best bit is bringing your proper table back and watching the other sqn(s) contemplate their mess bills.