When showering, always start with your hair and work your way down:
If you start with your legs and work your way up, all the grease from the top half of your body will recontaminate the already clean lower half as it rinses down.
When drying off after a shower, always start with your hair and work your way down:
If you go about drying off in a chaotic fashion, you risk the chance of rubbing your face with a part of the towel that's been in your ass crack.
