Don't know if this had anything to do with intelligence or just liking dessert...

Eldest DD went to a day care with kids 0-3 years old all in one large room. When she was about 11 or 12 months, she could walk, but it was easier to put her in the walker with a tray at snack time than to have her around the older kids. Babies like her got Cheerios for snack, but the older ones got cookies. The staff wouldn't let her use the walker anymore after she pulled this stunt a few times - get that walker rolling fast, crash into kid holding cookie, kid is stunned, grab cookie and eat.