I can't pin point many because as some have said those that are marketed as funny generally make me cringe like Will Ferrel, Kevin hart.
However those that do crack me up are those that are not intentionally funny.
Mel Gibson in Lethal Weapon cracks me up. It's one of my favourite films but he's just so damn dramatic in it it cracks me up. His zero fooks attitude when helping the suicidal guy and his arguments with Danny Glover crack me up. When he cries over his dead wife and tries to off himself it's meant to be a sentimental moment but it just cracks me up how he delivered that because it's so extra. I know it wasn't meant to be a funny moment though