Eeeeek a Mouse!

So the other evening I'm looking out my office window and notice a little mouse feasting on the crumbs beneath the bird feeder. He scurries around, popping down one hole in the snow and back out another. Before long, there's a second one! They're having a great time, running over and under the snow in --pretty much--broad daylight.
Before I know it, one of the mice has climbed right up the side of the house and onto the window ledge and is peeking inside.
"Wanna come out and play?"
"Thanks, but no."