Add a checkbox that the OP can click when submitting their new Post. This button says:
"Serious Replies Only Please"
When this checkbox is checked, an edit is automatically added at the bottom of the original post that states:
"OP has requested only Serious Replies. Anything violating this request will be deleted and multiple offenders of these requests will be banned."
of course you are going to need some dev work for this, and you'll want to be able to limit it to this forum.
But this would make your job easier for this forum.
And if the OP doesn't check it, then you can let the jokes (that are SFW) and inane replies remain.
"Serious Replies Only Please"
When this checkbox is checked, an edit is automatically added at the bottom of the original post that states:
"OP has requested only Serious Replies. Anything violating this request will be deleted and multiple offenders of these requests will be banned."
of course you are going to need some dev work for this, and you'll want to be able to limit it to this forum.
But this would make your job easier for this forum.
And if the OP doesn't check it, then you can let the jokes (that are SFW) and inane replies remain.