Red Bull issue gone wrong?

Ok so this morning I was with my friends a guy and a girl. The girl and I are in high school and each morning we hang out with the guy who is a year younger. So today we hung out and he brought a red bull that he got from a concert. We sat in a circle and ped it around (it was a joke because they have dope circles on that seventy show) Me and my friend (we'll call her E) never tasted red bull so we took some sips and decided we like it. Well l;later we started getting all giggly and stuff. We couldn't stop it. We thought it was a sugar rush but then we started just acting weird and our faces turned red and now I cant stop laughing. Is something wrong? Cause im starting to cool down now but looking back Ive never acted that way before and now im concerned for E because well.... she's really shy and she was just full on crazy this morning... Her bf (the boy who's a year younger) has a thing for weed... did he spike it?