Unexpected laughter... and unlicensed titles.
That is what makes great pinball... comedy. But comedy is just comedy, and with out timing, you have nothing. But timing is everything in comedy... the witty one liner needs to be said when it is the funniest, and that was what they were getting right in the 90's.
The funniest thing in recent pinball memory? "King of the Restarts"
GTF went after this and wow did it fly wide of the mark initially. Seems some actual gameplay has gotten more to enjoy shooting GTF, but it works best in dimmly lit, high noise environment where the cringe factor is less a thing since you miss most of the bad dialog.
I think we should start rooting for the homebrew machines, where there is little risk on theme selection... this should be the incubator for unlicensed titles, and manuafactureres could possibly score a coup by picking up a popular homebrew title once it has been debuted for either contract manufacture, or buy the license and do a short run. Would make more sense than betting the farm each time like AP has.