I don't know how, but German police have managed to put dents the size of fists in 33 tonnes of brand new steel water cannon truck, using just eggs and soft tennis balls. They've spent over $900,000 on the new trucks, and decided to test the quality of the first arrival, but went gently, pelting it with the above soft objects rather than the rocks and Molotov cocktails it might encounter in a real riot. The result was disaster. A report is being compiled (which will still be generating paperwork in 20 years, if you ask me). http://www.thelocal.de/20140422/900000-police-water-cannon-damaged-by-eggs ETA: And If you follow that link, at the moment there is also a story up about a man taping $200,000 to his genitals. But I'm not posting that one!