Catchiest riff of all time?

Which ones can you not get out of your head for days whenever you here them?

Here's some of my favourites....

Another one bite the dust - Queen
Iron Man - Ozzy Osbourne
Plug in Baby - Muse
Sharp Dressed Man - ZZ Top
Beat It - Michael Jackson
Rock & Roll - Led Zeppelin
The Trooper - Iron Maiden
Seek & Destroy - Metallica
Sweet Child of Mine - Guns & Roses
N.I.B. - Black Sabbath
Whole Lotta Rosie - AC/DC
Everything I Need - Aynsley Lister
Green Manalishi - Judas Priest
Ace of Spades - Motorhead
Oasis - Wonderwall
Panama - Van Halen
Bittersweet Symphony - The Verve
Smoke on the Water - Deep Purple
Sunshine of Your Love - Cream
Johnny B. Goode - Chuck Berry
Pride & Joy - Stevie Ray Vaughan
The Anthem - Trivium

This is far from an exhaustive list, I've probably missed some really obvious ones.

Nirvana - Smells Like Teen Spirit

I forgot about seven nation army.

You fool.

EDIT: Added some more

Every fucking Nicki Minaj song.

Forgot to add this.

Whole Lotta Rosie - AC/DC.

Guns N' Roses - Sweet Child O' Mine

RHCP- Otherside.

Bulls on Parade - Rage Against The Machine

Even Flow - Pearl Jam

Plush - Stone temple pilots
RATM - Killing in the name of
Steppenwolf - born to be wild