so would i use a semicolon?

Put that semicolon down, put your hands in the air, and step away from it slowly . . .

I see nothing wrong with making 2 sentences:

Wow, that is so crazy. What a small world.

Many "correct" ways depending on desired effect. My immediate response:

Wow that is so crazy(; , what a small world

The funnyface was supposed to be a colon: How we're at the mercy of incompetence in the Digital World

http://able2know.org/topic/212219-1

Yes I know why, but then why not (: also. The programmer evidently had a neck issue