DEMPs, especially, are great at making people bail from their tanks. When your tank is immobile and you can't traverse your turret to take down the approaching infantry, and you know that they've got DetPacks they're about to plaster unto your hull, it's very easy to panic and jump out to avoid death, but 50% of the time, if not more, this'll lead to the enemy dropping their DetPack plans and stealing your tank instead. Result: You still die, but the enemy also takes your tank.
"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.