What was Mel highest grossing movie?

Please clarify who you mean by "Mel."

Do you mean:

* Mel Gibson? If so, his highest-grossing film is "Braveheart", which grossed over $210 million in the US.

* Mel Brooks? If so, his highest-grossing film is "Spaceballs", which grossed over $83 million in the US.

Please provide more context so I can give you the correct answer.