an one-liner vs a an one-liner

Some examples from the web:

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Some examples from the web:

• How I love your mom's little pop psychology one-liners.
• We're not keeping him chained up for the one-liners.
• Well, it's got to be a one-liner.
• I get by on good looks and one-liners.
• He's riffing Corpsman Scully's one-liners from Astro Quest.
• Let me guess, you're trying to guess what she likes to drink so she might actually fall for one of your little high school one-liners.
• His idea of communication is-is he drops a witty one-liner and then shoots you in the face.
• I'm better at the enigmatic one- liners, Katherine.
• Abusively cynical one liner dismissing everything you just said.
• toys on his desk and the quippy one-liners.
• So when one-liners were really popular, everybody stole them from one another.
• Lord, thy one-liners are as good as thy tricks.
• Now, ladies and gentlemen... the Copacabana is proud to present the king of one-liners...
• Were the first few one-liners strong enough?
• It just happens... but what about the first few one-liners?
• Here is my one-liner - bed, now, go.
• One of them would crack a funny one-liner right about now.
• Now we could continue to point to other countries or individual sectors; these one-liners have occasionally cropped up in the present debate, too.
• Those - those were hack one-liners from the Internet.
• "amalgam of lackluster performances and sitcom one-liners."