Top 10 Greatest Unscripted Seinfeld Moments

The actors on "Seinfeld" are comedic geniuses, coming up with some hilarious lines on the spot! For this list, we’ll be taking a look at the best ad-libbed bits from the sitcom that weren’t originally included in the script. Our countdown includes dentist Tim Whatley taking a huff of nitrous oxide before putting Jerry to sleep, Jerry's impromptu line when the gang finds George's car wrecked by an angry mob, George offering his mother Tic Tacs in the hospital, and more! Which of these improvised moments surprised you the most? Let us know in the comments below.