Since a few people went off-topic and I don't mind, as this is my favorite all-time shop!!, let me ask this:
Have you ever done a milkshake shop alone? I LOVE their milkshakes, but I can't do them, because I always do FG in routes and no one wants to come with me all day to shop. I fee like it's too weird to order a fountain drink + a milkshake, as who would do that? That's two drinks. Maybe some ppl think of the milkshake as their dessert, but still. That's a lot!
Also, I end up throwing away the drink completely after a few sips and that feels like a waste. I'll drink the full milkshake. Their vanilla is sooooo gooood!
Is this overthinking it? Do normal customers ever order both a regular drink and a milkshake for themselves (i.e., single person only)?