best behavior (noun) p's and q's: proper behavior
Sinonime: absurdity, absurdness, antics, buffoonery, carrying-on, clowning around, craziness, disobedience, foolery, foolishness, hanky-panky, high jinks, hokey-pokey, horse feathers, horseplay, inanity, insanity, irresponsibility, ludicrousness, lunacy, misbehavior,
mischief, mischief-making, monkeyshine,
nonsense, poppycock,
prank, silliness, stupidity, tommyrot