Do you have underwear?

Kolby's been awesome at going poo on the potty. Since Olivia has poo issues of her own (i let her sit on the potty while she pushes with all her might), I haven't had to change a poopy diaper in a month! But the peeing is another story. Kolby will go pee about 3 times a day on the potty but i can't figure out how to motivate him to go every time. Then i thought, hey maybe we could buy some new underwear since he's had his other ones for a while. I tell this to kolby and he's very excited. We get to Walmart and the old man greets us. Kolby asks the greeter, "DO you have SPeed Racer underwear?" Greeter, "eh?" Kolby (shouting) "Do YOU have underwear?" Greeter (puzzled) "what?..." I explain that kolby wants to know if Walmart the store, not him personally has underwear. The old man chuckles uncontrollably and is barely able to hand us our cart. I'm not sure which part i found more humurous...my child loudly asking "do you have underwear?" or the fact that the old man never really answered the question.