Never knew it was so useful

[sparky]

 

[HappyPirate]

 

[MikeB]

Reminds me of other funny ads such as

 

[Plumage]

Genuine? Not so much:

Is a 1964 WD-40 Ad Full of Sexual Innuendo?

Rumor: A 1964 advertisement for WD-40 full of sexual innuendo?

www.snopes.com