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

80's for me all the way.

Most of the truly one-hit wonders, were that because the music really wasn't that good. I don't know about best, or what constitutes a hit, but here goes:

T Rex: Bang a Gong
Blue Image: Ride Captain Ride
Argent: Hold Your Head Up
Stories: Brother Louie
Malo: Suavecito
Norman Greenbaum: Spirt in the Sky
Vicki Lawrence: The Night the Lights Went Out in Georgia
Rick Derringer: Rock and Roll Hoochie Koo
Thin Lizzy: The Boys are Back in Town
The Buggles: Video Killed the Radio Star
Reunion: Life is a Rock
Wild Cherry: Play that Funky Music

Might be "Hallelujah" by Sweathog.
Or "Don't Walk Away Renee" by The Left Banke.
Or "Gold" by John Stewart.
Or "Venus" by Shocking Blue.
Or "The Rapper" by Jaggerz.
Or "Lay a Little Lovin' On Me" by Robin McNamara.
Or "All Right Now" by Free.
Or "Mr. Big Stuff" by Jeannie Knight
Or "All The Young Dudes" by Mott The Hoople.
Or "I Can't Stand The Rain" Ann Peebles (Willie Mitchell)

In the end, I'll go with the immortal "Kung Fu Fighting" by Karl Douglas (or......).

'Beach Baby'. First Class

David Essex - Rock On
Ram Jam - Black Betty
Sniff 'n the Tears - Driver's Seat
Billy Thorpe - Children Of The Sun