A somewhat interesting idea...
At J's flat last night, on inviting J's flatmate Martin to the pub
M: Tempting, but I can't drink alcohol tonight. I'm going to be part of some medical research tomorrow.
D: What are they going to do to you?
M: Stick a tube up my nose down to my stomach. Then I have to carry a box around with me that takes various readings for a day.
D: What for?
M: Don't know, I think ...