What is your favorite 1 hit wonder from the 70's?

Ozz, Inna Gadda Da Vidi was 60's. I saw Iron Butterfly when the song was a hit.
Stuck in the Middle with You was really Gerry Rafferty, he had a string of hits.

What was the hit by 'Spiral Starecase'?
(Pretty sure that was 70's but maybe it was 60's also).

Thanks Marty, and you are right, it is a great song.

You know, reading and being reminded of some of these songs, I'm not sure why we are nostaglic. :)

Little switch to the soul/disco side:
first, Disco Inferno by the Trampps- I think the lead singer went to prison for a while after he pistol whipped his girlfriend on Valentine's Day;
and...
Shuggie Otis, covered by the Bros Johnson:
Strawberry Letter #23- classic soul. Doesn't get any better than that.

Dayglow- fair enough. The only song from the Trampps that hit my radar was the Inferno song. As to Bros Johnson, Strawberry Letter really does it for me.