You may've seen the commercial on ESPN for the widely-known SportsCenter with John Clayton rocking out in his mom's house with a Slayer shirt on (and if not, I'll include it after you click through). 

Well, Clayton appears to be a Slayer fan in real life after a picture surfaced on the net with thrashers Kerry King and Gary Holt at the band's show in Seattle last Friday.

I just think it's really cool how some of those seemingly "outstanding, upright" dudes turn out to be heavy metal rockers on the side.

Check out the spot and rock on…