Oblivious cock
A man's cock is so dumb it gets hard whenever something walks by like a dog or a pizza and it might even explode in your pants without you asking for it
My cock got hard when my mom walked in with a pizza. I had to go hide in the closet.
I saw a cat and my cock went bonkers. I had to leave the room before I embarrassed myself.
My cock got so excited by a dog walking by that I came in my pants during a meeting.