When celebrating Father's Day, be glad you weren't sired by one of these men. Some of them were absentee dads, and the rest should have been. And if your dad actually is listed here ... we're so, so sorry.
Ryan O'Neal: the Michael Jordan of bad Hollywood parents, O'Neal beat the teeth out of son Griffin's head -- and that's not among his top three offenses (he shot at Griffin once, too). What puts O'Neal over the top are anecdotes like forcing daughter Tatum to snort cocaine so she'd lose weight. When a depressed Tatum tried to slit her wrists, he simply told her she'd cut the wrong way. Yikes.
Shawn Kemp: most famous from his NBA stint in Seattle, Sports Illustrated made him the poster child for deadbeat athlete dads. The Reign Man sired nine kids out of wedlock with seven different women. This put him behind Evander Holyfield (nine kids!) but first in our hearts. Besides, that's a lot of World's Best Dad mugs he has coming to him from all across the country.