Watch Chris Pratt Get Pranked by Dinosaurs in Poland

In Jurassic World, Chris Pratt plays a raptor trainer who can stare down the fiercest of dinosaurs. But all that preparation couldn’t prepare the actor for an actual T. rex ambush. In his latest video, Polish YouTube prankster Sylwester Wardega sends two very lifelike dinosaur puppets charging after Pratt. Watch his reaction above.

After Pratt gets over his initial heart palpitations, the Jurassic World star — who appreciates a good prank — isn’t sure whether to be angry or impressed. “You motherf---ers!” he shouts at Wardega. Then he turns his attention to the dinos: “These look great. Did you make these? What is this? Who are you?” Wardega explains that he’s the prankster behind last year’s Mutant Giant Spider Dog video (in which he dressed his dog Chica as a terrifying creature and filmed her scaring random passersby), which has been viewed over 143 million times on YouTube. “How do you say f--- you in Polish?”  Pratt jokes, before acquiescing, “You got me, man. That was good.”

Before siccing his dino puppets on Pratt, Wardega took them on a jaunt through his home city of Warsaw, where they scared the living daylights out of pedestrians and even had a run-in with the police. Watch his ‘Jurassic World Dinosaurs Prank’ below.