No one likes going to the doctor. That's probably why they sometimes go to crazy lengths to try and make themselves appear hip or funny.
Let's be honest, how many times does it actually work? Not often.
Now, what happens when your patients can't read? I think it takes a special person to be a vet, someone who is kind and compassionate and super patient, and that's just to deal with the pets. These signs make me want to switch from my own doctor to a vet because at least I'd get a good laugh out of going.