It's time for Part 2! Sarah Silverman is constantly annoyed by Jack McBrayer on the show, but don't worry, the other guest stars are great. Here are some hilarious moments featuring Jeff Ross, Charlotte McKinney, Howie Mandel, and David Letterman. Watch Stupid Pet Tricks on TBS.

Check out Part 1:    • Best Guest Star Moments (Mashup) | St...  

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Best Guest Star Moments - Part 2 (Mashup) | Stupid Pet Tricks | TBS
   • Best Guest Star Moments - Part 2 (Mas...  

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