scene: morning ward round
(A phone beeps)
Consultant: It's my daughter. "Dad, what's the stuff that platelets produce when they come into contact with collagen?" Anyone know?
Turns, looking questioningly at the room full of consultants, registrars an SHO and myself
Registrar: Why is she asking?
Consultant: She's doing her A-levels. Seriously, no-one knows? (turns to me) do you?
Me: (thinking that it's been more than three weeks since the last time I had to think about the coagulation cascade) No idea.
In retrospect, and with a quick visit to wiki, I guess she meant Thromboxane or ADP?