McDonald's Shamrock Milkshake
I used to look forward to McDonald's shamrock milkshakes at this time of year. Shamrock shakes were only available around St. Patrick's Day and had a minty sweet taste that would appeal to a 10 year old.
At some point, McDonald's stopped selling them. I'm guessing they weren't selling enough to make it worthwhile. It's too bad, I think the kids would dig them.
Here's an old ad for the shamrock milkshake, circa 1986.