hahaha very good.
about 5 of us did a night once,terrible night fishing,think the lake was empty so everybody started to go to sleep in their bivvy's.one of the lads tied a hook to some line,put hook other side of bite alarm and took the line into his bivvy then just pulled.........
all you heard was somebody falling off bed chair then zip on bivvy going then a fall outside of bivvy then alot of name calling and swearing,he did see the funny in the morning though!!!