This classic bit of Swedish ingenuity from Reddit:
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Translation:
Top left: "Just an attempt! 37mm Anti-tank cannon on standard tractor"
Top right: "Fast transport on truck"
Turning farm tractors into armed and armored tanks is as old as tanks.Here is one made in 1941

http://www.tanks-encyclopedia.com/ww2/soviet/soviet_KhTZ-16.php
We have seen some improvised armor done recently in Syria.Lots of videos of them on YT.