The grandson pushed his grandmother into the lake, fully aware that she couldn’t swim and was terrified of water, just as a joke. The relatives stood nearby, laughing, and none of them could have imagined what this woman would do once she made it out of the water 

The grandson stood at the edge of the pier, smiling as if he were about to do something harmless.

— Grandma, remember you said you couldn’t swim and always wanted to learn?