..."donkey!", a long-time favorite wish and fantasy.
You feel an immediate pinch behind you, and you whirl around, embarrassed at having been overhead giving words to your wish. But there is no one behind you.
There is, however, someTHING behind you. To your amazement and disbelief, you can feel a pressure behind you, and then spreading from the seat of your pants to include the rear of your right pantsleg. You can feel it growing longer until it finally stops just short of the hollow of your right knee. With little thought, you can make it twitch.
"Wow!" you whisper to yourself. There are so many things you'd like to do right now. You'd like to SEE your new appendage, but you can't just drop your pants here in the store. You also wonder how much further you can take this... or how much further you dare to. You have a pocket full of coin, and a lifetime worth of stored-up wishes. Your more practical side wonders how many more wishes, if any, you can make and still get home without undue attention... and if you'll be able to get back to the store and make some wishes to undo any unwise changes you choose to make.