another mishigas (which I for one will admit I do, but I think it should stop) is to spend so much on mishloach monos relative to the amount given for mattanos lo’evyonim.
or
how about bombing the chosson by his Oifruff with pekelach?! I was in a shul one time where the chosson’s friends whipped their pekelach as hard as they could towards the bimah. One kid got hit badly, the father blew a fuse, and then in a fit of rage, screamed (rightfully so) at the mishiginer for bashing his little son. I don’t have to describe the mood in shul after that. The simcha was ruined and the atmosphere was tense and totally blahh! I felt so bad for the chosson.