Severus Snape was an intimidating man. Cloaked in no colors other than black at any given moment. His sneer could make every single one of his students flinch. He had perfected his glare at a very young age, practicing in the mirror.
He ticked off each reason on his fingers as he opened his wardrobe and pulled out one of the many jars of hair wax, as he did every morning after his shower. The foreboding potions master even managed to make the black towel at his waist billow as he returned to his bathroom. Sneering into the mirror, Severus put a generous amount of the wax into his palms and worked it through his hair.
As a younger man, right after he started his student career at Hogwarts and had taken such an interest in potions, he had been HORRIFIED to learn that the humidity from the bubbling potions caused his luxurious black hair to curl and frizz in a most unacceptable manner. Since that moment he had reserved one entire wardrobe to his stash of hair products to keep his hair straight. Having greasy hair, and therefore being dubbed with the hideous nick name of 'Greasy Git' was only marginally better than having his hair curl and frizz like a girl's.
Severus Snape combined a sneer and a glare as he looked into the mirror at his traitorous hair before dressing and leaving his private chambers for the day.