I actually do have a story to tell you, fellow /a/nons.
When I was 16 (5 years ago, so IN B4 UNDERAGE B&), I was having some extracurricular drawing lessons, and in my class there was a girl about 14 that actually liked anime too. That time I was REALLY, REALLY stupid with wanting to have "otaku" friends in my small town where anime was almost unknown.
So... she just punched and slapped me all the time. I didn't really react much except scolding here, since she was really, really small.
...Until one day she stepped on my right foot, the foot I just had operated two days earlier. I didn't care about anything when that happened. I forgot she was a girl AND a child, and punched her face with all I could. After that, she started being more nice to me and we actually went shopping, watching some movies and shit together, and I kissed her a couple times.
Two weeks later, she said that "it wouldn't work out" and I was dumped, WAI.
TL;DR: Tsunderes EXIST in real life. They're retarded and need some slappin' to know what the hell is going on. Also, they're ugly. Little noisy bitches with huge noses and not cute at all.