When I was a small child, Anchor Butter ran an ad campaign with a jingle that went:
Anchor Butter, from green green grass.
And, as a very witty 8-year-old, I completed this with ‘… tastes like it comes from out of your arse!’ And we sang this in the playground.
Today, several decades later, whenever I see the Anchor Butter logo, that plays in a loop in my head and there is no possible way that they can remove that association and there is no way I would ever buy their product because I do not want that association on my toast.
The moral of this story is: if you are marketing a consumer product, before you launch a campaign, ask a focus group of children of all ages to make fun of your slogan. You may cause serious damage to your brand otherwise.