Since I was a little'n I've always been able to regurgitate food, some foods easier than others. A bowl of ice cream? I can make the stuff slide right back up with ease. After a steak often big bits come back up which I then chew on again for a while. The best thing is, as long as it isn't too long after I've eaten, then it tastes just as good as it did the first time round! I think I share some genes in common with cows. I can do this too. I never considered it weird though, I just sort if figured it was common. Is it a rare thing?
As for me, I'm not sure I can pinpoint what makes me weird, I just know that I am. We all are.