Bandwagon = Jumped On

I have a confession: I have not read the Harry Potter books.  Or at least, I’ve only read the first two or three or whatever the series had got to in 2000.  I’m sure I’m not alone in this, but it is odd for me, because a) I read constantly, and fairly indiscriminately, and b) I went through a big fantasy stage as a kid, and still have quite a respect for youth fiction of this nature.