Follow QI on Twitter ▶ http://twitter.com/qikipedia Follow QI on Facebook ▶ http://facebook.com/officialQI Follow QI on Instagram ▶ http://instagram.com/theqielves Subscribe on YouTube ▶ http://youtube.com/theqielves For more visit ▶ http://qi.com This clip is from QI XL Series N, Episode 4, 'Noble Rot' with Sandi Toksvig, Alan Davies, Jeremy Clarkson, Jason Manford and Sara Pascoe.