Venting and Pet Peeves

Ok, I go to take a shower the other day and my towel is not where it's supposed to be.  Someone has taken my towel to use as their own.  This is MY dirty towel, mine, mine, mine.  I confronted said person this evening and they gave a very poor excuse.  "I didn't know whose towel it was.  Mine was in the dirty clothes."  Now please tell me, does that give this person the right to use MY towel?  I should think not.  I wasn't the one who got into the shower without looking for a clean towel and I wasn't the one who put their perfectly good towel in the dirty clothes.  Now, I don't have many "pet peeves" but this one just entered my very short list.