It occurred to me tonight that we're only two months away from Shamrock Shake season. I was so elated I could hardly speak, so I rushed over to Wikipedia to see what our friends, the good people who fight trolls and build the encyclopedia, thought about it.
The answer - no article. It's a redirect to McDonald's Products, and has been that way since October. It actually wasn't such a bad article before that.
Maybe they don't think it's notable? Well using their favorite research tool, Google, one can easily find plenty of articles in major newspapers about the Shamrock Shake.
So what's the reason for deleting it? It's notable, it's economically important, it's a public health issue (many children receive much-needed nutrition from these shakes), and millions of people have heard of it.
I think this is part of some larger patterns. 1. Wikipedians hate big business 2. They hate McDonald's specifically, 3. The notability guidelines are a mess, and 4. Deletion/merging has become a POV battle-weapon.