Not sure why I didn't post this, but okay. Let's make the fangirls and fanboys screech all over again from cuteness overload. XD;; From my askblog on Tumblr - Ask A GLaDOS Fangirl.
I second this. I've got one out of the 4 cats here who does this periodically, and I generally just either wait her out or turn on the bathtub faucet instead - which is enough to get her to vacate the sink. She doesn't do it that often, but it's both cute and exasperating when she does.