You roll two twos, and you suddenly feel strange.
You have a sudden strange itching over your chest, and without thinking take your shirt off to examine it. On your chest you see a small puff of fur, but before you have time to concentrate, you feel a massive pain in your lower back as if somethign was squeezing it!
Not thinking of where you are, you quickly strip off your pants and underwear leaving you naked, and see a long feline tail slinking out behind you.
Then a sharp twang in your hands and feet, as they become paws and you fall over onto all fours. You shrink more, and your ears move to the top of your head and become oddly catlike.
Finally, fur starts to spread over your body, covering your nakedness.
In a few moments, you are no more physically than a common house cat.