Aside from warming our brains and framing our faces, hair provides the only concrete evidence of the existence of wind. Treat breeze detectors right with today’s Groupon: for $25, you get $50 worth of salon services at Hair By D.

Hair By D's experienced stylist has travelled the world to tend to the tresses of everyone from television and movie stars to members of the Canadian tap-dancing team. Straight hair can finally mimic its favourite coiled waterslide after a full-service perm ($80), and shampoo, cut, and style treatments send split ends and outdated ’dos into a black hole of oblivion ($36+). Kick classy occasions into turbo-classy occasions with an elegant updo ($40+), which clients can admire in the salon's full-length mirrors. Kids' cuts make for stylish schooldays or days spent playing surgeon ($10 for ages 0–6; $15 for ages 7–16), and colour treatments imbue adult noggins with an opulent new hue ($48 for roots; $80 for full head).