Pick any class but gren. Have a vehicle ready. Re-choose class to gren without killing yourself. Make sure your RPG/mortar is NOT reloaded (it wont work if it is). Stand next to your vehicle with your mines equiped, drop all of them and quickly enter the vehicle as the game will automaticly try to equip your previous weapon. It should now look like this (I'm in the driver's seat, not second seat):
Ah.. That bug, never got to report it because I never knew how I got it (except that I was gren). Also managed to see the nose of the rifleman somehow if I can recall...
Yeah i can imagine that it works with rifleman aswell, but instead of dropping mines you throw nades. It's not really a major bug though, I get it like once a month or something.
So how did you naturally discover this? Your comm get meds, you kill-spawned, forgot to switch class, went to switch, figured you'd mine the VF, and kapam? Weird bug IAC.