There's a superb thread on the UA forum about jokes to play on UA employees:

http://www.flyertalk.com/forum/showthread.php?t=609460

What jokes should we play on BMI employees? Well here's a starter:

Invite a BMI employee to dinner at your house. When they arrive, give them a small tube of pringles and explain that no hot meals have been loaded today, only drinks and confectionary. Charge them for the pringles but only accept exact change and no credit card because the cost is below £5.


As an OT aside, I have worked out how to get a cup of tea when the only change I have is a £20 note! Buy the a bottle of the overly sweet champers plus the cup of tea and pay by credit card!