The Cereal Aisle Incident
Took my 7 year old to the grocery store and he wanted every single cereal box with a cartoon character. I told him 'You know those mascots are just trying to trick you into wanting their cereal right?' He looked at me dead serious and said 'Dad, I think the cereal is working.' Lost it in the middle of aisle 5. Bought him the Fruity Pebbles.
This is the worst. Every single cartoon character feels like a personal request to them. I started just going straight to the healthy stuff without even letting mine see the colorful boxes. It's easier that way.
Oh man, the big eyes when they see Frosted Flakes or whatever. You just know they're running the calculations in their head about whether to throw a fit. How'd it end?