Man's Underwear

Once I came home and Mama Lai combined my laundry with the family laundry.  When I got home, Mama Lai confronted me:

"Why do you have man's underwear in you clothes??!"

I may have been just as surprised, but as she waved the evidence in front of me, I laughed:

"Isn't that dad's underwear?  Didn't you do my laundry with yours?" 

Mama Lai looked at the underwear in her hands and in realizing her mistake said:

"You do your own laundry from now on."