What Kind of Demon are you?

Make them choke up and cause them to fail.
Play pranks on them
Ask them if they want to have sex as a reward
Bring someone that is a threat o their achievement

Tell them their bride/groom has cheated on them
Put Poison Ivy in the Brides Flowers
try to have sex witht he bride/groom before they walk down the asile
Tell the brides family that the grooms family just wants in on the life insurance and accidents are bound to happen

Make the condom break
unscrew all the bolts on the bed, HAHA!
watch the entire show
start a fight between them