The Bachelor Party is the last hurrah. It's the last time you or your buddies can hang out and be just the "guys". After your married, its over, your never going to see them again. So make sure you bachelor party is the end all of parties with your friends. If your the Best Man, well then, you are solely responsible for sending your friend off with a great memory (if the booze doesn't kill those brain cells), and a smile on his face.