When Beowulf first arrives, Unferth is unimpressed and tells everyone about the swimming match the Geat supposedly lost. He then goes on to dourly proclaim,
"No matter, therefore, how you may have fared in every bout and battle until now. This time you'll be worsted; no one has ever outlasted an entire night against Grendel" (525-528).
His ill-conceived behavior can be best matched to that of which traditional Greek comedic figure?