well, i had trichotillomania as a kid. i think that was due to stress, but yeah, that was pretty weird.
weird things that I still do involves me closing the curtains, taking about 5-10 minutes to plan out a conversation, clicking my knuckles a lot, humming while eating and guessing people's heights...
so yeah, i guess those are all considered 'abnormal', though i'm slightly against those terms.
i'm guessing the height of the guy above me... 5'8?