Keep that in mind

A phrase used when someone offers you useless or moronic advice, which will be immediately disregarded but you do not want to offend them, sparing their weak minds.

Them: Hey maybe you should join the Army. You know that its a great way to see the world. You will become more of an individual and nowadays they can place you in jobs that won't involve you having your limbs blown off or your face looking like Freddy Krueger's.

You: Ya, sure. I'm gonna keep that in mind.