John Mulaney plays Mac’s boyfriend on It’s Always Sunny In Philadelphia, a rocking twink who just won’t quit. Dennis gets very jealous and tries to sabotage the relationship by playing very vicious “pranks” on John’s character in an effort to intimidate him into breaking up with Mac. What he never expected was the most spineless people-pleaser on the planet, who says “I’m sorry” when Dennis pours hot, piping soup in his lap. The episode is mostly Dennis gradually going insane as his increasingly terrifying hijinks are met with no antagonism whatsoever