What does “don't make me laugh” mean?

used to show that you think what sb has just said is impossible or stupid

How is “don't make me laugh” used?

In Witness for the Prosecution (1957), one line is: “- Letters written to the prisoner? - To the prisoner? Don't make me laugh.”

The clip at the top of this page is from Witness for the Prosecution (1957).

- Letters written to the prisoner? - To the prisoner? Don't make me laugh.

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