Sera Jokes

K.O. - Hashgacha of the World Boxing Federation
DANNY K - Supervision of the Vaad HaComedians
K SERA SERA - Hashgacha given by liberal branches of Judaism
K MART - Hashgacha given by Rabbis who have decided
to discount their normal fees and make money through volume.
YUD K, VOV K - Under Divine Supervision
I'M OKAY, YOU'RE OKAY - Hashgacha given by the local psychiatric association.

Knock Knock
Who's there?
Kay!
Kay who?
Kay sera sera!