I (we) (they) laughed until (to the point of) they cried (wept)
No, it's not what I meant.
The meaning was, that even though one would laugh on something, it would be, in fact, not laughable but pitiful.
That is, for what the phrase laughter through tears
In this case, one can laugh on stupidity of someone else, but stupidity itself is not funny but dangerous...
I'm glad, that you like the kitten-signature.