Velcro's 'Don't Say Velcro' Trademark Ad

HN cites it as the go-to example of a company defending its trademark, and many also find it funny.

Velcro Brand's legal team makes a short, humorous ad asking people not to use "velcro" as a noun or verb and to say hook and loop instead. It is a tongue-in-cheek lesson in defending a trademark against genericization.