Bad Company 2 with C4. (Best weapon ever)
It was on Arica Harbor, the first stage of rush, and I'd ran outside of our base (We were on defense) and set all my C4 down in a pile on the road going towards the base. I run out of there and hide, and five seconds later, a humvee (forget what they're called) comes tearing down the road at top speed, so I detonate the C4. I thought I was too late, but it exploded right under his back tires, and the humvee is sent high into the air, flipping, and doing cartwheels. It must have been in the air for five seconds before it finally landed, and exploded on impact.