If you serve from the carboy, you'll have REAL
ale, which is flat. (at atmospheric pressure there is some CO2 in the beer, but not much)
Otherwise, you'll be priming & bottling or putting it back into the Mr. Beers to carbonate.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk