What does "Watch out for the tiger" mean in the back of the car?

There is an explanation about the precautions of bears, you can refer to that, but that standard answer is not standard.

This sentence is a pun, which can be read as "pay attention to the tiger", which means the answer upstairs; It can also be understood as "the tiger didn't pay attention". Tigers and bears are both stupid, which means that others don't pay attention to themselves when driving, and they are easy to hit.