There's a reason The Beatles wrote a song called "I want to hold your hand". It's because mostly people find it really, really awkward when they accidentally touch someone else's hand. For some reason, this fear seems to loom large over the usual young male population.
I don't know if it's homophobia or simply a fear of physical contact with a stranger, but for what it's worth, sometimes it is pure comedy gold.
Just like this video here.
That guy in the middle though...