Well, Kuzco was certainly not expecting that to happen.

The emperor stood still in the hallway, letting the shaving cream slowly drip off his face. After several seconds of that, he reached up with his big sleeve and wiped the mess away, revealing his very unamused face.

"That... was not cool."

Turning around, he raised his fist in a show of assertion, though he really didn't intend to hit anyone.

"Alright, who's the wise guy?"