Skidding out of control

While picking up Jacob from daycare he tells me "Mommy, I have skateboards in my underwear".
I asked him to clarify "skateboards? what do you mean?"
Jacob "skid marks"
Me "oh that's great, who told you that?"
Jacob "Miss Heather" (his teacher)
Apparantly he thought he crapped his pants and pointed to the stain in his underwear when Miss Heather told him, "no, you're okay Jacob, it's just a skid mark." He was satisfied with that response and was happy to tell everyone about his skid marks like it was a prize.