Very common in conversations. Especially if it's important or its the latest gossip.
Person 1: Omg, you guys wont guess what happened... Jess punched Anna right in the nose and there is blood everywhere! I was standing there watching and they were having a major rowl then..
Person 2(Talk-Over): Lol, It was so funny Jess threw such a rad punch it hit her square in the nose and blood went everywhere.
Person 1: Guess what? I was at the mall yesterday but i forgot my wallet. I found this really spiffy dress but obviously i couldnt get it, so i stole it. It was so different and i felt so..
Person 2(Talk-Over):I once stole a chocolate bar, from the supermarket and i..
Person 1(Talk-Over): Hey shut it Im talking. Yeah I have the dress here do you wanna see it??