What Kind of Noise Does a Rabbit with Wheels Make?

Finn has started to make car noises when he plays with cars. It's a kind of "vvvvrrrrrrrrrrghhhhhhh" noise that also sounds a little bit like he's spitting.

SO FREAKIN' CUTE!

It's not like M. and I taught him to make car sounds. He picked this up all on his own. He makes the noise with his cars...and his little plastic helicopter...and his rabbit. Yes, his adorable little wood rabbit pull-along toy that he got as a gift for his birthday.

M. and I were a little confused about this development until we realized that the rabbit has WHEELS. So what sound does a rabbit with wheels make? Well, according to Finn, "vvvvrrrrrrrrrrghhhhhhh".