What normally happens to a man's penis when his favourite football team scores?

Explanation

A man's penis becomes erect when sexually stimulated because of the positive blood flow. The opposite is the case if it encounters e.g. cold water. What many people do not know is that non-sexual stimulation can actually have the same effect, because the blood is needed elsewhere in the body. So when the favourites score a goal in an important match, a true fan's penis will shrink!