hmm.. I think 'normal' is like a barometer (known in english?) where people can fallow.
some want to insert in this normality and some are not. I like all the kinds of abnorm cause its more independently. but to say something is wiered just because its not known is narrow-minded and ignorant..
(Please forgive me for my bad english)
Normal is based on you own morality or (to be specific) on the surroundings. Normal is usually decided by the majority of society. Let's say you are in a room with a bunch of people who have bright neon green hair. Everyone in that room is normal but you.
I think normal is based on the society and social subjects right now, the past ones were Gangnam Style, Harlem Shake, and now something else happening.