What's got into?

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.

Common Names:

Name	Pronounced	Usage
Sunny	SUN-ee	English
Julienne	zhoo-lee-EN	French
Astaroth	-	Literature
Kustaa	KOOS-tah:	Finnish
Kerr	-	Scottish, English (Rare)
Kirtida	-	Indian, Hindi