In the dark days of WWII (the part before America moseyed on in and just totally saved everybody, all by themselves, no foolin',) the British were anticipating a full-on Nazi Blitzkrieg to come rolling right over the White Cliffs of Dover. Short on weapons, but well-stocked with fuel and moxie, the British decided to kill two birds with one inferno. Yep, they jury-rigged themselves some giant, tank killing, flamethrowing landmines ("Fougasses" was their technical name, but all the other weapons would make fun of them on the playground if they knew.)
Via Wikimedia Commons
FIRE. SOLVES. EVERYTHING.
Luckily, for all fans of activities like 'having skin' and 'not roasting like a chicken,' they were never actually used...
Not the case in Russia: According to this order signed by Field Marshal Georgi Zhukov, a Soviet "FOG Static Flamethrower" destroyed 4 tanks and an entire company (around 150 men) of submachine-gunners, causing the survivors to understandably flee in panic, seeing as how the mouth of hell opened up and melted their god damn tank and all. The Germans, possibly inspired by the effectiveness of the device (or just to silence the screaming in their heads) designed their own Flamethower Landmines later in the war.