As he reached for the doorknob his vision blurred.
"oh, dammit. dammit. dammit!"
He began to realize what he had sat on and didn't like it...for all of two seconds.
The heat of his body grew as if he were on fire. That was the second sign. Adam tried to remember what the cure for this was but found he was beginning to swell up between the legs. He tried to push it down and as he did he remembered the third sign. His stupidity had just accelerated the fourth sign and soon came number five.
Much as he hadn't wanted to before he developed an obsession with kneading his crotch as his body swelled up. His last sentient thought was that this would have been a good day to have worn some lycra or some other superheroic material. He was about to start looking like one.