Best puzzle feel free to steal

Before you stands 2 doors a guard at each one

"Hault traveller's, one of us only tells lies" slowly turns to guard 2

"Kenneth I swear to god I've said it a million times it was an accident"

"Answer my riddle adventurers, how does one "accidentally" f#$% my sister"

And you continue this drama and the party beats the puzzle when they get a word in edgewise or solve the argument, or kill them both.

(I am sure I'm stealing this joke from somewhere I think I came up with it, but it's so obvious in my head I doubt I am the first)