When I was 5 I did this. I remember thinking 'how hard can it be?'... you know, giving yourself just a little trim. Maybe a little off the top? When my mom asked, 'why??!', I told her I wanted to look like Ernie from Sesame Street. That was the first thing that popped into my head.
And her trying to hold back a laugh while arranging to get my hair fixed. Oh dear.