This little boy loves trains, and his mother often sits with him outside to watch the passing trains and wave at them—whether there are passengers inside or not.
On this day, the approaching train was a cargo train. But there was a driver with his head out the window to wave at!
The little boy giggles and waves at the passing driver—and to his surprise, the driver waves back!
The boy is delighted—but then he realizes something.
At first he laughs, then tears up, shocked, then he turns and asks his mom for some confirmation: “Dad?!”
“Yes, Dad!” she says with a laugh, kissing him on the cheek.
Then it finally clicks, and he bursts into laughter hilariously. He’s seen trains pass by the house countless times and he loves them—his father is a train engineer after all!—but this is the first time he’s realized that the driver is Dad!