It's Always Sunny In Philadelphia: 10 Cameos You (Probably) Missed
5. Dennis Haskins
Dennis Haskins plays Charlie's former gym teacher who is accused of molestation in Season 1, Episode 7, "Charlie Got Molested." The gang then tries to prove that it really happened even though Charlie denies that the teacher ever mistreated him. This leads to a hilarious scene of Mac trying to seduce the former teacher by wearing tiny shorts. They later find out that the teacher was set up and never harmed any of his students.
Haskins is famous for playing Mr. Belding in Saved by the Bell. He also had cameos in New Girl and How I Met your Mother.