Mental Humor

Yesterday, I was walking along the fence to the hospital's mental wing
and I could hear a chorus of patients in the courtyard shouting, "13....13....13....."

I couldn't see through the fence, but I saw a small peephole in the
planks, so I looked through to see what was happening.

Some idiot squirted me in the eye with water!

Then they all started shouting, "14....14....14......"

After a brief recovery, I almost laughed up my lunch.