Soft ice cream and coffee. 260 yen in total at a local McDonald's

Today I came up with an idea that at McDonald's I could get a coffee and an ice cream at the same time for much less than what I would pay for a corn ice cream at 31.

The result was very satisfying. I was able to enjoy the ice cream to the very end without the ice-cream headache. 

I wonder why I hadn't thought of this before.