steve K Amos's "Its a joke...Tell your face" is brilliant if you can adapt it.
Example:
A few months back me & a group of about 7 friends went bowling. So we split over two lanes, The two couples on one side and the singles on the other (read: Nerds (im in this group)). Anyways we arrived @ 22:00, and we thought the alley shut at 00:00...it shut at 23:00...we only JUST got on.
Anyways, Thats the back story.
it gets too about 22:40, and we had finished our game, And the couples were taking longer.
it came up too one of the womens turns, and she was dicking about. After being asked several times by all of us too take her shot as we were running out of time, her bf took the shot for her (him being the best bowler) and got a strike. She threw a strop.
Its a typical rule of thumb that if a couple has a strop with a large (3+) group of friends then whoever in the couple is offended throws an evil glare, Then drops a bollock when theyre alone. Unfortunately she decided that this format wasnt good enough and stropped off down the now empty adgacent lanes, And sat that like you would see a stropping child.
5 mins past and her bf went over too her, said something (lost interest and was in and red mist had decended at her rudeness) and she come back over, Sporting a face like a smacked arse. At which point i uttered the (now immortal amoungst my friends) line
"Hey *name*...Its a happy day, Tell your face" in the same accent that Amos does the beggining of his act.
oh it was funny.