Kristen Bell [1], I promise if you come to my house for Thanksgiving dinner [2], I will be nicer to you than Ellen DeGeneres [3]. The Frozen 2 [4] star made a surprise appearance on The Ellen DeGeneres Show [5]'s Nov. 26 episode, and she got more than she bargained for when the mashed potatoes [6] were served.

Ellen took her audience through a "typical" Thanksgiving feast setup, from a grandpa swiping through Grindr on his iPad, to an aunt and uncle who can't keep their hands off of each other. Around the three-minute mark, however, she unveiled Kristen as an unexpected guest. "I can't believe I got a babysitter for this," Kristen joked, as Ellen fed her forkfuls of potatoes and . . . whipped cream? Yeesh, that's one plate I really don't think I could stomach. Watch Kristen be a good sport while Ellen gets some serious glee from pranking her pal. What are the holidays without a little friendly drama, right?