ACTUP

• Activist group whose motto is Silence=Death

• Be a brat

• Be bothersome

• Be bratty

• Be mischievous

• Be naughty

• Be rowdy

• Become troublesome

• Behave badly

• Behave in an unruly manner

• Behave like a brat

• Behave rudely

• Behave willfully

• Capt. and you misbehave

• Carry on

• Cause a ruckus

• Cause problems

• Cause trouble

• Earn a time-out

• Emulate a brat

• Get out of line

• Get rambunctious

• Get rowdy, e.g.

• Go on the fritz

• Make a nuisance of oneself

• Make a scene

• Make mischief

• Malfunction

• Misbehave

• Raise hell

• Recur, as arthritis

• Recur, in a way

• Scream or be rowdy, as a child

• Start to malfunction

• Stop behaving

• Throw a scene

• Throw a tantrum

• Throw a tantrum, say

• Turn impish

• Turn naughty

• Turn unruly