If you are looking for a great bachelor party gag, this is it. You make a ball and chain using an old bowling ball. Then chain it to your friend's leg and make him carry it around all night. That sucker will start to get really heavy really quickly.
I used to work at a company that had an honorary bowling ball. Each time someone got married they chained it to the person and wrote the bride's name on the bowling ball in white-out (or white paint). The best part was that all of the women's names were written in small letters. Dawn, Sue, Sally, Debbie, but in hug gray letters someone had married "Gertrude". I thought that was really funny.
Anyway, you can make a ball and chain for your bachelor/bachlorette to carry around at the party! This simple gag can be made for less than