Aaahh!!! Real Monsters (1994)

S3E15 You Only Scare Twice

Ickis, Krumm, and Oblina choose an unassuming Englishman as their target for a scare, believing it will be a simple task. However, they quickly realize that frightening him is far more challenging than anticipated. It turns out the Englishman is actually a secret agent, skillfully evading threats at every turn.