What do you do when someone says something so stupid that you don't know how to respond?

[Anonymous]

[tfan1]

I’ll look at them shocked and say, hello? Anyone home? Or I might say. Come here. Look at me. Are you in there?

First one was from back to the future. Second one was from mama’s family 👍🙂

[genericname85]

i don't respond.

[AnnieBabe]

I'll just look at them with a blank expression for some seconds and say "are you okay?'

[Anonymous]

I just say “well bless your heart”