Name movies where the main character has played an imposter

[GARFIELDKOOL]

The few I could think off the top of my head are

Houseguest-Sinbad

Mrs. Doubtfire-Robin Williams

Big Momma's House-Martin Lawrence

[Brian Damage]

Face Off

The Associate

White Chicks

[sara]

Dave

[Pentimento]

"The Impostors"
"The Great Impostor"
"Catch Me If You Can"