How bout a varient of the original question??
At the local indoor range, we would hang a BG target attached only at the top and would have someone reel it in while trying to make as many 'HITS' as possible. If you hang it a little off center, It'll swing left to right (or right to left) as it approaches you. Sort of simulates some one zig zagging towards you.
RIDE HARD...SHOOT STRAIGHT...AND TELL THE TRUTH