I guess maybe it is pretty common. I was bowling today and one of the little kids on the lane next to me left it at least 2 times. Only difference is he was able to pick up one of the spares! Maybe I should use a 6 pound ball for spares!
Just hard to imagine hitting the 3/6 and missing the ten while still somehow managing to take out only the 4 (and not either the 2 or the 10).
Played around today and tried to get that leave, but could only manage the 1,2,7, or 1,2,10. Oh well, thats what makes this game so interesting!