Do You Believe in Extraterrestrial Aliens?

I actually believe in them and in my own opinion and belief I'll swear I've seen some odd occurrences in my life.

When I was in elementary school, we were outside for physical education and a big black... flying something flew a good.. 20 to 30 feet above our heads, nearly silent and it was gone in the blink of an eye, was I just imagining it as a child? Who knows, but It seemed real as anything then and I remember it clearly to this day.