how do you get the secret strike on the hundred pin bowling?

I have wii sports resort,and i have gotten all my stamps except the one for the secret strike on the hundred pin game.Has anybody figured this out,I know it has something to do with the bumper but i have tried everything and cant figure out the secret strike.please help.

move all the way to the right and throw the ball on top of the bumper it will travel down the bumper and a lightning bolt will strike the pins.

Secret strike stamp wii sports resort