You were doing your nails. You'd found that after traversing the universe, your nails tended to get a bit dirty. So, you decided the best plan of action would be to paint them. You knew they'd end up getting scratched off eventually--- but they'd look pretty for the moment being!

You chose your favorite color from the bag of different polishes you had aboard the TARDIS, unscrewing the cap and starting the first layer of polish. On the fourth finger, you heard the Doctor rambling to himself about god knows what as he came into the room.

Suddenly, he stopped his ramblings, his attitude changing immediately. "What's that." The Doctor demanded, sounding like an irritated cat who had just seen a pickle. He didn't like the chemical adjacent smell he was currently inhaling.