I was going to start a thread similar to this...although the title was gonig to be a bit different

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Last night I am in a tower and notice an enemy flakpanzer rolling down the hill towards my vh. So, I upped a tiger to intercept him.
When I get out the vh and train my guns on the flak, he's merrily shooting the vh. Obviously he was so intent on killing the VH he didn't see me as a threat. I open fire from point blank. Direct hit. Zero result. Again I fire, again nothing. I then switched my ammo load to HE shells. I fired two more times at the flak. Nothing. Apparently though, I've annoyed him enough because he starts to fire upon me. I circle around his machine, continuing to fire both AP and HE shells directly into him...from all angles. He gives up firing on me, and lays back into the VH, as his shells are just bouncing off the tiger. Finally, the VH explodes. He is sitting right next to it, so he simply exits his vehicle. I get no credit for a kill, because he wasn't damaged. In the end, I took a total of 16 shots at the flak, using both HE and AP rounds. I hit that thing from every angle.
Needless to say, it was rather frustrating.