I always feel gatecrashing can be fun and less torturing if you have the right "sisters".. for my best fren's wedding, I was the sister... I plan the games...
For brothers, I ask them to drink black coffee without sugar or milk... and biscuits with smashed century egg... the brothers was telling me its yummy
for the groom, i ask him to eat sour, spicy, sweet and bitter but all in shot glasses and no mixture.. he do it without complaints...
we played Q&A and they were so confident thinking that I am asking abt the bride's details, end up I ask 10 questions on Man U football club (it was the groom's fav team)
everyone had fun and they told me they enjoyed the Q&A... so I think it's really up to individuals... just don't go overboard... and unless u can eat the concoctions that you make, if not dont force it to the brothers and groom...
to end it, I'm going to have a gatecrash but i will make sure it will fun and no degrading stuff....
the bf told me he's game and he even thot of a plan to "convince" my sisters to open the door for him...