Spike began talking like a snake-oil salespony: "Hey, what's up everypony! It's ya boy, Spike, and I'm coming at you again with another Ponyville Local Food Review! This time, we're taking a look at the new item everypony's going crazy for…"
He reached into a paper bag and produced an extra-large cup, heavy with purple ooze.
"That's right, locals! It's the Grimace Shake! This ha-"
Just then, he turned, his eyes half-closed, inhaling for a long moment, before settling to a disappointed frown.
"Sorry. All the pollen, you know? Benefits of living in a small town - the allergens! Yeah, you know what I'm talking about. Anyway, this went crazy on ClipClop, so I just had to try it for myse-"
He paused again, turned, but tried to power through it.
"Hah-h-h. So I'm just gonnaAH-CHOO!"
Spike sneezed. In a burst of flame, the milkshake disappeared from his claws.
"Uh oh."