I found underwear in my pants.
I changed from gym shorts into the shorts I had on this morning, not yet showered, and so not changed out of my athletic undertrousers.
Packed into a car, bought and ate submarine sandwiches, back to the car, just somewhat uncomfortable. I noticed black fabric protruding from a pant leg. I pulled and pulled until I was holding a complete pair of boxers! What magic? None such, I assured my teammates, I am just inattentive.