Chugging a Diet Coke - who does that?

Apparently the bartender at Baxters thought I did.

Yes I drink rum and diet coke. A refreshing alcoholic beverage with 1/2 the guilt. I'm not sure why Mr. Bartender thought that I was sucking diet coke super fast through the straw just for the hell of it. Who does that? Seriously. He asked me if I wanted another drink, I said yes, and slurpped what was remaining in my cup. He proceeded to refill my glass with JUST diet coke. I almost fell off my bar stool from the laughter.