My Son, the Bra Thief

I got ready to change Danger Boy's sheets last night and started removing the 32 dozen stuffed animals he had amassed up there (he is in a loft bed) only to find the black bra that I had been hunting for over a week.

He had to have put it up there.  I know for certain it wasn't in the sheets when they were put on the bed. 
Now what the heck does a 7 year old do with a bra?   I have come up with 3 possibilities:
1)  He is a fledgling cross-dresser.
2)  He is already becoming a boob man.
3)  He wanted something of his Mommy's to keep him company because he is scared of the dark.

I am going with the 3rd one just to keep my sanity.