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."