In french the word "marcher" can be used either for "walking" or for "functioning/working".
The classic prank was to call random numbers in the phonebooth and ask "does your fridge work/walk?" Pretending you're trying to sell them a new one and when they'd say yes to get rid of you, you'd suggest them to buy it some shoes (damn weren't we smart in the 90s).
All that to say, there's a joke around that concept somewhere in there.