The last episode sees self-confessed science geek and adrenaline junkie Greg under pressure as he and an inflatable friend attempt to dig to Australia. He will stop at nothing to answer some of life's weirder frequently asked questions and is sucked into quicksand to discover if it is as deadly as the movies make out. He eats a stupefying amount of fast food to see just how quickly you can get fat without really trying and, with the help of a pig, finds out whether it is physically possible to die of a broken heart.