Your granpa: "Geez whiz you young rascal. When my family went on road trips we didn't have a drive-thru to stop at. Us young whippersnappers had to pack our own ham and cheese sandwiches, then we'd hop in the car with our parents, and *we'd be off like a dirty shirt.*"
Your granma recalling the good times on her deathbed. Sighs, "Your granpa used to *ride me like a stallion.*"