It’s no secret that Houston Texans Head Coach Bill O’Brien boasts a rather, err, colorful vocabulary. It was a known commodity during his days at Penn State, and now it’s amplified on a national level thanks to HBO’s Hard Knocks, which currently features O’Brien’s Texans. While O’Brien’s animated obscenities make for good television, they don’t stand well with O’Brien’s mother, Anne.

“I think it’s one thing when you’re coaching the kids and involved in football and practices,” said Anne O’Brien in an interview with KHOU 11 News. “To be honest with you, he doesn’t talk like that when he’s home at all. Well, he’s never talked that way around me.”

Though his mother might disapprove of her son’s language choice, he seems to have found way to put it to good use. O’Brien implemented a “swear jar,” and vowed to make a donation to the Texans Foundation after his profanity use is added up. The Texans Foundation benefits children throughout the Houston community, assisting with educational programs, character development, and health and fitness. The foundation’s mission is to “help empower the next generation of Texans.”

Hard Knocks is still going strong, which means O’Brien is subject to a hefty fine if his foul-mouthed ways continue. CBS Houston’s Sports Radio 610 has been tracking each O’Brien curse, making the list available online for fans to stay up to date. For those keeping score at home, O’Brien’s tab currently runs at $92.75. I’m not a betting man, but I’d say it’s almost a guarantee that BoB will eclipse the $100 mark by preseason’s end.

It’s refreshing to see vulgarity being put to good use, and gives fans yet another reason to watch the show. For those who find O’Brien’s profanity entertaining, there’s now an incentive for the coach to swear.

Tune in to Hard Knocks every Tuesday night at 10 p.m. on HBO.