Was playing around in panzer the other night, and was helping take a V base. An opposing player pulled his tank into a hangar, and pulled close enough to the door that his barrel was protruding through the structure. He was able to fire rounds at me, but my rounds simply exploded on the hangar.
Have film of this incident if any HTC folks would like it. I'm not sure if this is an exploit or a bug, but it certainly gives someone a pronounced advantage.