It was in a friendly Vegas league (lots of spouses, good friends, etc.).  Anyway, I was bowling against one of my good friends and he missed a 7 pin in the gutter.  He was a bit frustrated and stepped on the foul line to intentionally foul.  Now, I believe the rule would give him zero for that frame.  So I said to him (in a joking, I'm giving you a hard time voice), "Hey that was an intentional foul.  That's a zero."  He said, "Fine, go ahead and change it."  Of course I said I was only joking, but in the back of my mind I was thinking that if we lost the game or total by 18 then I would be upset.  As it turned out, we won the game and total, so I never gave it another thought.

What would you have done?
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Regards, ClutchClay

I used to think the same thing - I believe the rule used to be that the intentional foul was zero on the frame no matter what.
However, before I called a guy on it last year, after being corrected by a member of this board, I checked the rules. Indeed, there is no penalty. If there were two pins standing, and he hit one, then intentionally fouled,he would get no count on the ball - he would get the count for the first ball, though.

I would like to propose that all leagues adopt a rule that either has a provision for zero for the frame, or a monetary fine - like the swearing fine in my scratch league - that actually DOES get inforced.

Thank you all for correcting my understanding of the rule.

I'm glad I didn't force the issue.
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Regards, ClutchClay