You're given a sentence and your task is to classify whether the sentence is acceptable or not. Any sentence which is grammatically correct, has a naturalistic text, is written by a native speaker and which minimizes superfluous content is acceptable, otherwise unacceptable. If the sentence is acceptable then write "acceptable", otherwise "unacceptable".

The kids laughed themselves into a frenzy.
acceptable

He's the happiest that I've ever seen him.
acceptable

Be very clever.

acceptable