He could be the first CUSTOMER.
Breaking Bad Season 4, Episode 5
Or as you may know him,
Dave from AT&T Customer Service.
The Big Bang Theory Season 3, Episode 4
Yeah, you're my first CUSTOMER today.
The Big Bang Theory Season 6, Episode 1
...just to complain
about their CUSTOMER service.
The Big Bang Theory Season 3, Episode 17
Yes, but at this point,
pretty much any CUSTOMER does.
The Big Bang Theory Season 7, Episode 13