Riding Toy?

Calvin has several toys that are made for riding.

 And then there's this poor guy.

 As you can see from his size, he is NOT a riding toy.

 But that isn't stopping Calvin from trying to ride him.

 He knows he has to straddle it

 and sit on it.

 Now scoot around.

Opps!

 Let's try again, leaning forward.

 Nope.

Keep trying, buddy. 

No, wait! Don't! It's not a riding toy!