I was thinking of starting Krav Maga, do you know anything about it?
Of course ive been practicing it for a long time, I use Krav Maga for its focus on real-world situations and its extremely good efficiency. 
Interesting, where did Krav Maga originate?
Well it first derived from the street-fighting of Hungarian-Israeli martial artist Imi Lichtenfeld, who made use of his training as a boxer and wrestler as a means of defending the Jewish quarter against fascist groups in Bratislava, Czechoslovakia, in the mid-to-late 1930s.
Interesting, can you tell me anything else about it?
Well Krav Maga is pretty lit. It can be used as an advanced form of self defense that is even as good as doing karate in some cases. 
Do you know much about other forms of martial arts, like jiu jitsu?
Yea, In fact Jujutsu was developed to combat the samurai of feudal Japan as a method for getting past the samurai armor an opponent wore.