I'm on meds so I'm sure I'll think of more later...
For starters:
The housekeeper in
Rebecca
The uncle in
The Lion King
Roger in
Roger & Me Honorary mention to the Miss America & Bob Eubanks
Chris whatshisface in
There's Something About Mary
The
Night Of The Hunter guy
Danny Devito in
Ruthless People "I love wrong numbers!"
Linda Blair in
The Exorcist
Chris Sarandon in
The Princess Bride - "And remember, this is for posterity, so be honest."
- Jake