I still, however, am determined to find a group of willing bikers for a prank photo op. I want to take a photo of my mom astride a Harley, or some similar huge machine, with a big burly biker sitting behind her, grinning, and the rest of the gang around them, grinning. I want her hands on the handlebars, and maybe a bandanna around her forehead. Maybe a leather jacket on, too. And I'll send it to the Flaky Sister. And wait for the incipient heart attack.

That would be awesome! And you can make up a story about the bikers and change it every time, and your mom will not be able to confirm or deny any of it.