Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: He seems like he 's mentally impaired somehow . As I ' m going through the spiel , asking him what size what bread what sandwich what cheese , my coworker ( we 'll call her Smash ) mouths to me , " HE 'S SO DRUNK ! " Ahh , that 's what it was .

Question: Why does the person come off as mentally impaired ?
They are inebriated .
The person's behavior might have been mistaken for mental impairment, but it was actually drunkenness.