Dougal pushes the red button

While Florence and Dougal use Train to vacuum the litter around the village to make it nice and clean, Dougal pushes the red button out of curiosity (which both he and Florence didn't hear Mr. Grimsdale's word of caution as they left with the parts needed for Train) and causes Train to speed around the village and vacuuming everything in his path, including Brian.

Example of:
What Does This Button Do?