A person in a lab coat places a glass half-filled with a yellow liquid in front of 4 people.
Immediately, the first person pipes up, “Ah, I see the glass is half full!” This person is an optimist.
The second person states, “Naw man, why would he bring us a half-full glass? He obviously drank some. It’s now half empty.” This person is a pessimist.
The third person scoffs, “Why must you two argue? It’s just a glass with liquid in it.” This person is a realist.
While the three of them bicker, the forth person grabs the glass and downs the liquid. With a wipe of their sleeve, they exclaim, “I got thirsty listening to you guys, so I drank the liquid in the cup!” This person is an opportunist.
The person in the lab coat lets out an audible gag, before running to a nearby toilet and losing his lunch.
This person is a Urologist.