You decide that as long as you're going to be wandering around someone's house uninvited, then add insult to injury by eating their food, you might as well be polite about it by drinking the stuff that's been specifically labeled for you to drink. You grab the flask and begin chugging the stuff. It tastes like water flavored lightly with honey and perhaps a touch of peppermint. The stuff is a little less thick then an average milkshake and tastes good enough that before long you finish the entire flask. It does occur to you, though, that perhaps drinking a potion marked "Drink Me" might not be the smartest move. You close your eyes and wait for something to happen. But nothing appears to.
"Well that was anticlimactic." you think to yourself. With your your stomach now full, you feel ready to continue your trespassing. You sally forth...or you try to. You find your self "sallying forth" face-first onto the floor. It appears that your legs no longer work. You attempt to stand up, but find that your hands, arms, and more or less your entire body are just as useless.
It's only after lying there for about 5 minutes that you begin to notice...