While listening on random, Pliers – Bam Bam came on, and I knew that I had heard the rhythm (or 'riddim' in proper reggae-speak) and vocals before. I took me a while Googling and searching through my music collection before I pieced the puzzle together. Groove Armada – Fogma uses a sample from Sister Nancy – Bam Bam.
I discovered that I had the 'original'(?) Toots and The Maytals – When Bam Bam, Chaka Demus & Pliers – Murder She Wrote, and even M.I.A. – Fire Bam (Diplo Mix) all based on the same bam bam riddim (produced by Sly & Robbie). There's a nice riddim index of Bam Bam.