Well, my little human rug, I brought along my dirty hiking boots today - and I'll now clean them on your face! Yes, I know the deep tread is very painful - but unfortunately the dirt sticks to it pretty well - so I'll have to stomp down hard to get it all out! But you gladly sacrifice your face to get my shoes clean, don't you?! Not that it really matters ... you're not getting away anyway! And don't scream so loud ... what will the neighbors think? :-D And if there's any dirt left in the tread, you'll lick them clean afterwards ... until your tongue is also bruised! :-D