Red v. Yellow

Courtesy of Auntie STFU&GBTW, the boys have a rather large tractor/trailer. It's big enough for a 2 year old to sit on to "drive". It has 2 proportionally large cars: one red (Jr.Gopher#1) and one yellow (Jr.Gopher#2).

This is their current favorite video. Don't bother to turn the sound on - it's just repetitious electronic dee-de-dee-ta-dee.
(ed. Mr. Gopher recommends leaving the sound on, to let the rhythm help drive the excitement).