You know the person showering in the cubicle next to you is a girl if…

1. You hear a deeeep low singing voice.
   • 0.001% chance of it being a girl. I don’t want to consider the alternative.
2. You don’t see the top of a short-haired head over the cubicle wall
   • 20%. It may just be a short guy.
3. You smell a strong, sweet scent of shampoo
   • 40%. Some guys want to smell nice, too.
4. You DO see the top of a long-haired head over the cubicle wall
   • 60%. Chance of tall girl > chance of long-haired boy.
5. You see a girly towel draped over the cubicle wall
   • 80%. Don’t ask me to define “girly”. You’ll know it when you see one.
6. You come into the toilet and find the shower cubicle occupied; you do your business, go back to dorm to take your shower equipment, take a shower, go back to take your toothbrush etc., brush your teeth, floss, shave, and are about to leave the toilet when you realize that the cubicle is still occupied by the same person.
   • 99.999% !!!

(Disclaimer: Percentages have not been empirically tested.)