In college, we had this guy in our department we nicknamed "smiley." He was always grinning and obviously had something not right in his brain. One day, it was just myself, a female friend and smiley in the computer lab. My friend elbows me and mouths "look!!!" smiley's over there looking at the pay stuff. He realizes we're observing and he turns to the friend and smiles like she's happy about it. He later got tossed out when there was a computer class, lights come on and there's smiley going to town squeezing his tomato