A gecko sticks to a vertical surface because of the huge surface area on its feet (thanks to microscopic hairs). If you ran the gecko's feet under a tap, (or dipped it in a pond), would the gecko just slide down/fall off the vertical surface, because it's feet were busy sticking to water molecules instead?

And if it did, would it have the emotional capacity or facial muscles to look surprised? 

I observed some years ago that if, having first stirred a mug of hot-chocolate one taps the bottom of the mug from within with a metal teaspoon the note given off rises quite distinctly with each tap. I have not reproduced the same effect with tea or coffee. However, any normal ceramic mug and brand of drinking chocolate seems to produce the effect. What, if any, are the special properties of hot-chocolate that produce this rising note effect?