was fällt euch

how dare you

→ was
phrase Rare #41,261
how dare you Usually part of “Was fällt euch ein?” as an expression of indignation. With “dazu,” it can instead ask what ideas come to mind.
GE: Was fällt euch ein, einfach mein Fahrrad zu nehmen?
EN: How dare you just take my bike?

Was fällt euch verdammt noch mal ein?

What the hell do you think you’re doing?

— Fitzcarraldo (1982)

Was fällt euch dazu ein?

What comes to mind when you think of it?

— Plötzlich Papa (2016)

Was fällt euch ein?!

What do you think you’re doing?!

— 3 Idiots (2009)

Was fällt euch überhaupt ein?

What even comes to mind?

— Aquarius (2016)

Was fällt euch ein, so über Tom zu reden?

How dare you talk about Tom like that?