The Gordon Kimbrough one is a good one.
While not a bodybuilder, Ken Patera's McDonald's incident I always found hilarious. There's just something so amusing about a giant roided out wrestler and champion weightlifter being so pissed about missing a meal that he starts throwing boulders and beating down cops.... He'll always be my favorite ol'er.
Not amusing- old time champion bodybuilder Roy Hilligenn turning out to be a kid toucher.