The ice melts and dilutes the flavor! Instead of getting Coke, you get a half-Coke, half-water monster. You may as well fill half the cup with tap water.
Not only this, but if wherever you're going to doesn't offer refills, then you're [i]paying[/i] to get less pop.
Now, I know what you're probably thinking: "Who's this dumbass? I need the pop to be [i]cold![/i] Does he expect me to drink warm pop?! What a loser. He must eat babies." Well, there's this thing, you might have heard of it, pretty new invention, it's called a [b]refrigerator.[/b] Stick a two liter in there for 20 minutes, and it's as cold as iced pop. Plus, pop from the fountain at restaurants is already cold.
Come at me.
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If the soda is refrigerated it's dumb to put ice in it, but if it's at room temp or warmer the ice is beneficial. What I don't get is people getting ice in their drinks at restaurants whether fast food or otherwise. It takes up space in your cup, is pointless since the soda is almost always cold, and when the ice melts your drink tastes disgusting, worse than if it were just warm.