. >> hence the paul shaffer look. >> it is the paul shaffer look. this is the uniform for canadian musicians now. >> well, it helped you in that last one, and now you are on the doorstep of that next threshold, that $50,000. again, when you get there, that's the least amount of money you'll be taking home today. all right, still two lifelines yet to be used. >> right. >> you're on a good roll. >> good. >> let's play "who wants to be a millionaire." >> yeah. [dramatic musical flourish] >> here's your $50,000 question. though now used extensively for food, what was used during world war ii as a way to preserve blood plasma for use on the battlefield? >> [exhales] you know what? i think-- i think this might be the time for me to call on my plus one. >> your friend andy. >> my friend andy. [laughter] >> he just ran out of the building. >> yeah, yeah. [laughter] i think i--yeah, even if he doesn't know, at least it's someone to talk it out with, and i would feel a lot better just talking it out. >> is that your final? >> let's final that. >> andy, come o