If they wanted to end it on a funny note, what could they have joked about instead? Somebody being bitten by the bad dog and "oh, now you're going to turn into one, like a vampire"? "Imagine if Jim had bitten you, you'd turn into Kirk." "One Kirk is quite enough, thank you very much." "Some might say, more than enough." "What was that?" "Nothing, sir." (cue laughter)