Hanging a spoon on the face
I would say the answer on this website is pretty near perfect.

To summarize, you need 2 things:


Enough friction between your nose and the spoon
The center of mass of the spoon should be on a line vertically downwards THROUGH the tip of your nose as illustrated in this image from the same website:




The friction is highest if both your skin and the spoon are free of greasy `lubricants'. Breathing on the spoon will add more friction by depositing a very thin (only a few atomic layers) film of water which, on this scale, behaves solid-like due to ordering effects as shown in this paper.