well, ask ur fren how comfortable is she with the jie meis
teasing the groom, and the extend of it... then start ur 'evil'
planning... 
i feel that the day belongs to the bride and groom, and the other
people are not there to fool the "couple of the day", but to make
it as memorable for them as possible...
maybe instead of games, you can get the groom to act out the first
time they met, sing their special songs or do something that the
bride always wanted him to do, but could not get him to do, etc...
watever it is, do something that has meaning to them.
i tink they will thank you for that... : )
