You're a cool friend! One of those guys everyone knows and everyone likes! You need a way to say hello, so instead of shaking hands, you give high-fives. Not just any high-fives, though...the HARDEST HIGH-FIVES IN THE ENTIRE WORLD!
Dude! Stop it! When I go in for a high-five I'm expecting a good hit with small a small sting-back factor. With you, though, I get hit harder than a crash test dummy at high speeds. My hand turns red, pain shoots down to my elbow and I'm partially numb for five minutes. Not cool!
Hey guy that gives unnecessarily hard high-fives! YOU'RE A BIG JERK!