How do you do it?

So, I'm running errands yesterday; post office, Target, Kohl's (returns from Black Friday), and then Sam's and home. When we are walking around Sam's I look down at Porkchop and notice that he doesn't have his left shoe on. Crap! It's not in the cart or anywhere around.
"Where's your shoe?"
"I don't have it."
"Really? Well, who does?"
"I don't know."
We begin a search around the store looking for the lost shoe. 10 minutes later...
"Is it in the car?"
"What?"
"Did. you. have. the. shoe. on. when. you. came. into. Sam's?"
"No."
"So, it's in the car?"
"No."
*panic*
"Did you lose it at Kohl's?"
"No."
"What about...run through all the other places we have been?"
"No."
*deep breath and acts of great restraint*
"Do you have any idea where you left your shoe?!"
"Yep."
Jellybean chimes in, "He couldn't find it at home."
"You've been walking around all afternoon with only one shoe?"
"uh huh."
"and I, Mother of the Year, have just now noticed?"
"Yup."
"super."

We get into line and a tired woman with a tired toddler looks at me and says, "How do you do it? I can't even handle one."
"Apparently, like this." pointing to the shoeless foot.