This guy is visiting his girlfriend who is in a coma in hospital.
The doctor watches as he tickles the underside of her foot. Her vital signs show a bit of a reaction, so the doc asks him to try touching her behind her knee. The monitors register even more of a reaction. The doc is intrigued, so suggests feeling her thighs. Even more of a reaction! So the doc whispers “I'll pop out for a minute - why don't you try a bit of oral sex - see how she reacts” So the doc comes back in 5 minutes… the monitors shows nothing.. a flat line! He says “Christ, what the fuck happened? Did you try what I suggested?”. The guys answers “Ya, she must have choked…”