The actor stars as a dinosaur trainer in the new blockbuster, the fourth in the Jurassic Park series, and he had a major scare backstage at the film's unveiling in the German capital on Monday (15Jun15).

Online prankster SA Wardega arranged for two huge dinosaurs, operated by humans in lifelike suits, to run at Pratt as he walked along a corridor with his entourage and he filmed the star's reaction.

The actor yells out and runs backwards before sinking to the floor. The joker then reveals himself and Pratt exclaims, 'Oh man! You motherf**kers! They (the dinosaurs) look great. Did you make these? What is this?... You scared me! You have cameras?.. You got me, man!"

Pratt also asks a female member of his entourage whether she knew about the prank, and the woman admits she was in on the joke and apologises.