Cudi, who replaced West as a festival headliner on short notice, was repeatedly pelted by water bottles from a disrespectful crowd.
The musical guest also honored the late "Saturday Night Live" cast member Chris Farley.
"It feels like there's an earthquake in the restaurant," the "Little Women" star recalled on "The Tonight Show."
The two caught up at Kid Cudi's birthday party along with Timothée Chalamet.
Yeezy brought the house down when he joined Kid Cudi in Chicago.
"I would’ve killed myself."