You've seen it a million times. Character A is approaching a door, or is standing beside or in front of a door, when abruptly the door is thrown open from the other side by Character B. Character A is then revealed to have been squished against the wall by the door when it was smashed open.
While this is a type of Slapstick that is very common in animation, being hit by a door happens in [...] [tvtropes.org]