It's another one of those "Battlefield Moments" haha... I've had a few myself.
I was playing on Arica Harbor, we had just taken the first set of M-COM's and were advancing down the hill towards the second set. I was playing with my recon class and I put C4 on a tank and proceeded down the hill. I went right into the middle of the small city, right next to where A is behind the garage doors, and I got out and ran into the building on the left.
I waited for two members of another team to hijack my tank (it only took a few seconds), and BAM. Double kill