Worst guest in show history?

In light of recent events, I’ve been wondering about what other blankies consider to be the worst guests (either one-offs or repeat offenders) in the show’s history. For me it’s Demi Adejuyigbe on the Stop Making Sense episode. Nothing against him, and maybe the stakes of the episode were just too high for me, but the whole conversation felt stilted and awkward with him, and his humor just really left me in a bad mood.