Do you remember the movie Vision Quest? Released in 1985, it was a romantic drama starring Matthew Modine and Linda Fiorentino. It was a moderate success, grossing $13 million at the domestic box office, with rental revenue doing a little better than that.
However, it wasn't called Vision Quest everywhere in the world. In some countries, the movie was titled Crazy For You, and this song was the reason. A young Madonna appeared in the movie and performed this song, which ended up being her 2nd number one hit in the US and her biggest hit to date. The title change was put in place to capitalize on the success of the song.
When the song was recorded, Madonna was an unknown, but by the time of its release, she had a couple of big pop hits under her belt. This was her first ballad - and broadened her appeal. The song itself is a sweet, straightforward love song that captures that feeling that so many have experienced.