bear in mind

Officially means: "To remember, think about, or consider someone or something (in regard to something else)"
However, it is often used in conjunction with the phrase: "Thank you, I'll bear that in mind" to express that actually you won't do that and it is a way to avoid exploding towards a remark someone has made.

Due to the unfettering threat of bear attacks - stemmed by one Mr. Stephen Colbert - it is an idiom that suggests one should be mindful of there surroundings, especially when one ventures into known bear territory (Note: Terra Firma is considered bear territory).

This phrase can intrinsically refer to Melissophobia as well.