Jay and Silent Bob Strike Back, 2001
This guy played Jay in the well-known films about the adventures of Jay and Silent Bob.
It turns out Mewes got into cinema because of his friend, director Kevin Smith (the one that played Bob). He tried to save Mewes from drug addiction and invited him to perform in his films, including Dogma and Clerks. Jason acted in films for other directors too but still remained goofy Jay for everyone.