Ha! Who knew little Mason was such an actor!

The tyke told paparazzi to "scram" in his comical pseudo-English accent as he and mom Kourt and sis Penelope left the movie theater in Calabasas the other day.

Funny enough, Kourtney doesn't fight it -- she knows the family's invited the media into their lives by choosing to have a reality show for the past decade, so she just laughs at little Mason and calls him a "funny guy."

It's not just Mason who has comedic chops -- check out his younger brother Reign last month, as he ran toward the paparazzi to hug them!