Funny Story About Panties

About a month ago, my girlfriend pulled panties out of my drawer, held them up, and asked, "Whose are these?"

There is an innate response mechanism for this situation and it causes a man, guilty or innocent, to freeze solid and then stammer.

"They're not yours?"
"No."
"Are you sure?"
"Yes."
"If they're not yours, I don't know whose they could be."
"Well, they're not mine."
"Are you sure?"
"Yes."
"Honestly, no other woman has been here. I swear."
"OK. But these aren't my panties."
"Are you sure?"
"Yeah."

After an hour...

They were hers. She just forgot.