Dippity-do

Invented in 1965 for setting curls, the gel, with its unique, jellylike texture, later gained popularity among young men. Subsequently the packaging went from a jar to a blue squeeze bottle, which can still be found on shelves today.

FYI: When he was a teen, the late rocker Eric Carr, of Kiss, reportedly drenched his hair in Dippity-do and pulled a stocking over his head before bed in an attempt to get his curly hair to lie flat, like the Beatles’.

To buy: $4, drugstore.com.