I have a bad habit of seal-clubbing, hahahaha. Take one slow Cruiser MK II (tier III tank), equip with one 89mm howitzer (tier V gun), and drop it into one town map with lots of corner camping positions. You get an 8-kill run including instantly taking out a dangerously-skilled enemy platoon member (who was teamed up with what I think is a NA League-winning player by his WGLNA username), that would have destroyed our team single-handedly, right at the very start of the match.
I totally regret not recording this match because it was a beautiful example of how OP this gun and tank combo is at low tiers. Instead, here's Jingles' take on the Cruiser MK II which got me interested in buying one in the first place!