A funny groom wedding speech is always a hit if done correctly!  This is one area that you will not want to do unless you can do it properly.  I would never attempt a funny groom speech unless I hired a professional speech writer or used an exceptional speech guide.

If you choose to do a funny speech, then prepare to practice it with your best man and a few buddies.  I would even go so far as to say drop in at a local Toastmasters Club.  Sign up as a member and get some tips.  You can practice your speech on them.