Catch Someone with Their Pants Down

To discover someone in an embarrassing situation

Teacher's Pet

A student who is the teacher's favorite

Steal Someone's Heart

To cause someone to fall in love with you

Bite the Hand That Feeds You

To act badly toward someone who has helped you

Cry over Spilt Milk

To be upset about something that has already happened and cannot be changed

Go Bananas

To become very excited, angry, or crazy