Say What?

After a night of drinking with friends, and some events of the evening forgotten, this was said to me by a certain female individual, who's name has been respectfully requested to be withheld:

"Neal! How come when I woke up yesterday morning, there was a big chunk of metal in my pocket?"

Apparently, when leaving the pub, I found a metal square on the ground, about the size of a McDonald's cheeseburger. So, I gave it to this female friend, as a token of our everlasting friendship.

She didn't remember me giving it to her.

Some friend, huh.