apparently, this is actually something mice do when they're courting, is leave nesting gifts. i don't imagine the rodent is quite that confused, but it's still a known act of affection.

a mouse would like my diet.

a mouse would like the pizza. right?

there was nothing left out for them to get at, but if they smelled it and/or watched me make it, it could conceivably want to hang out.

if it stays in the wall and eats roaches, whatever. but if it's going to crawl into my bed and make me sick, that's not cute, and it has to go.