The stunt was to celebrate Father's Day over the weekend and the results were pretty hilarious.
"I wrecked my car in high school."
"I dropped your toothbrush in the toilet and blamed it on the dog."
"One time, when we said we were having a sleepover, we just... we went to Chicago."
"I found $20 on the floor." [Where did you find it?] "Maybe, in his drawer..."
"That I've never smoked weed before."
"The first girl I kissed was Susie in second grade."
Dad: "But she's your sister?!?" Son: "I know."
This being Kimmel, not all the admissions may be true. But the reactions are still priceless.