Onlookers at Sushi Roku restaurant in Santa Monica, California got an eye and ear full when Nick Lachey and his soon-to-be-ex father-in-law, Jessica's dad, Joe Simpson, bumped heads.

Rumor has it that Nick had been dining with a buddy and was all set to leave when Joe walked in, spotted Nick, and said bluntly, "You'll never get half of everything in the divorce settlement."