Actor Mark Wahlberg, a Boston native, is a big Celtics fan (although probably not as big as his brother Donnie, who was a guest of The Big Show Thursday at the Staples Center). Mark accepted a bet from legendary rapper (and Los Angeles-area native) Snoop Dogg on the NBA finals. The loser will donate $20,000 to the winner’s favorite charity. Here’s Snoop Dogg talking about the bet.