Yes I train karate, and also jiu-jitsu.
Who-whatsu?
It's mainly ground fighting.
Punching people on the ground?
No, there's no striking
Then how do you win?
With submissions.
What's a submission?
Making someone say "Uncle".
How do you do that?
You can attempt to break limbs, or cause enough pain to make them want to give up. My favorite is to choke people within seconds of unconsciousness.
They do all those things to you, too?
Well, they try
You let people try to break your arms and choke you?
Yep.
And you do this for fun?
Uh-huh
You're crazy! Stay away from me!

"One person's craziness is another person's reality." — Tim Burton