* "Giddy up, Thunder! We got a turkey to shoot!" (Playing on Red Ryder's iconic BB gun)
* "Faster, Thunder! We're late for Christmas!" (Playing on the time of year the toy was popular)
* "Come on, Thunder! Let's outrun those bullies!" (Playing on the idea of Red Ryder being a brave, adventurous character)
Ultimately, the best answer depends on how you want to frame the riddle!