What's got into?
What's got(ten) into (someone)?
Why is someone acting in such an unusual or unpleasant way? What is upsetting or bothering someone? Jeff just screamed at me and stormed out of the room. What's gotten into him? What's got into Sarah? She's been avoiding me for days now. I don't know what has gotten into him lately. He just isn't acting like himself.
What's got(ten) into someone?
What is bothering someone?; What caused someone to act that way? (Past or perfect only. The has is contracted except for emphasis.) I just don't know what's gotten into her. I don't know what got into me.