This is normal when text messaging, but annoying when facechatting, hence the name facetexting.
JayJay: Did you see the Lakers game?
Brad: Yeah that touchdown at the end was amazing
JayJay: Yeah, but I don't think it's gunna be very good. Oh yeah, I punched the air when Tommy Nelson scored.
Brad: It will be good! I'm going. I know right, I punched the air really hard.
JayJay: Stop Facetexting dude!