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Exploding Trousers. In 1930s New Zealand, apparently it was quite the rage amongst the farmers to have exploding pants. So the build team tries to found out just how this happened.

They put together four compounds common to the time - fertilizer, black powder, gun cotton and herbicide - and four methods that might have ignited the compounds - flame (match, cigarette), radiant heat, friction (walking) and impact - and try to make something happen. Out of these sixteen tests, only three really cause anything useful to happen, and those are all based on the herbicide, which makes sense, as there was an outbreak in that time of herbicide due to farmers trying to eradicate growing weeds.

So they pack up and head out to blow up Buster's pants. In the end, they make some nice flames, but nothing explosive. Now if you were wearing pants and they burst into flame, you might say that they exploded, but this is a finer point, and there wasn't an explosion, so they make one and Buster ends up in pieces all over the hills of California. Confirmed (basically).

Great Gas Conspiracy. Many products are available that purport to add mileage to your car, so Adam and Jamie put them to the test. The check out magnets that say they line up the gas atoms, acetone to burn fuel better, a miracle carb and even a hydrogen fuel cell to generate hydrogen to feed directly to your engine. None work with a darn.

Finally they pump hydrogen directly into the engine and it does work - until a large backfire convinces them they better turn off the flow for now.

Then, in a scene directly out of the Dirty Jobs episode Bio-Diesel Man, they filter used fryer oil and take a diesel for a spin, finding out that just this simple act can stick it to the man. Busted (mostly).