17. "The President Did It" Is Not An Excuse (Season 10, Episode 9 - Mayored To The Mob)
Proving that The Simpsons has been forever topical, this episode aired on December 20, 1998, just one day after impeachment proceedings began against President Bill Clinton following his sexual scandal with White House intern Monica Lewinsky. While it's hopefully not a reference to Bart partaking in some of Bill's more infamous activities, it's still a pretty hilarious gag and has also aged pretty well for those who have caught it on re-runs.