Heidi Fleiss and Tom Sizemore Clash on 'Sober House' (VIDEO)

It's no secret that Tom Sizemore and Heidi Fleiss have had their issues on 'Sober House' (Thu., 10PM ET on VH1). But things came to a boiling point on last night's show, when Sizemore gave Dr. Drew Pinsky an ultimatum.

"I'm not staying," said Sizemore. "Either she goes or I go ... so I'm gonna go." Some people are just oil and water, and these two are as oily and watery as they come.

Watch the video after the jump.It's no secret that Tom Sizemore and Heidi Fleiss have had their issues on 'Sober House' (Thu., 10PM ET on VH1). But things came to a boiling point on last night's show, when Sizemore gave Dr. Drew Pinsky an ultimatum. "I'm not staying," said Sizemore. "Either she goes or I go ... so I'm gonna go." Some people are just oil and water, and these two are as oily and watery as they come.