Slowbro: Do you have time tonight?
Me: No sorry, I can't stay late tonight, I have a thing with my wife.
S: Oh yeah, I'm not staying late either.
M: Oh, so what do you want?
S: Can you help me install linux?
M: Uh no, I can't stay late -
S: No, no you don't have to stay, you can do it from home.
M: What? No I don't have time tonight. Wait you want me to take your computer home?
S: No, no I need to use my computer tonight.
M: So... What do you want me to do?
S: You can do it on your computer.
M: You want me to install an OS on your computer, but on my computer??
S: No, no *sigh* just try it on your computer so we know it will work on my computer. It is a proof of principle.
M: Reinstall my OS?
S: As a proof of principle. So tomorrow when we do it on my computer, we need not waste any time.
M: ... No I'm not going to reinstall my OS just as a test for you.
S: Not a test, a proof of principle.
M: What are you.. I'm sorry, I don't have time for this tonight.
S: Just a proof of principle!!
M: Ok see you.