SPACEBALLS (1987, Mel Brooks)

This "oh no, not again" line has to be one of the funniest lines in cinema history.

Get this guy some Pepto-Bismol

And also featuring the same actor as in Alien: John Hurt.

The best parts are the fact this both 1, has happened before 2, happens often enough to the point they’ve built a door for the alien.

This was the first time I died laughing. It was so crazy to me that they would reference another movie (not lost on me: the entire movie itself. I was young.)

The best part is that without looking closer initially, figuring out if it's alien or Spaceballs is an honest question lol