The rider barely held on when the motorcycle suddenly went into a tank-slapper on the highway.

The comedian's new routine was a real thigh slapper that had the whole audience in stitches.

The comedian's final punchline was a real knee-slapper that had the whole audience roaring.

At the summer fair, the ankle slappers on the novelty stand made everyone giggle when they smacked people's ankles.

I paddled out hoping for something bigger, but the only thing that came through was an ankle slapper that barely pushed my board.

When Grandpa told that story at the reunion, it was a real knee slapper and had everyone in stitches.

Local police warned that groups of happy slappers were targeting commuters during the morning rush.

Witnesses identified him as a happy slapper who filmed his attacks to post online.

Experienced riders know that tank slappers can be terrifying at high speeds.

Experienced riders know to relax their grip and let the bike settle when tank-slappers start at high speed.