When a man and woman are having
sex 'doggie-style', with
the man wearting a condom, and the man says,
"Oh look, a disappearing
panda."
And when the woman turns to look at the man, he quickly pulls out, removes the condom and snaps her in the eye with it.
As in the previous example, which did not state the
sex being engaged in was 'doggie-style',
"I can't believe how dumb she is. I actually pulled a Disappearing
Panda on her last
night."