Mine would be my creative sides magnus opus; a crying freezer.
After discovering a icewall at the back of the freezer, we found that some form of nasty, benevolent gas had been sneaking out in the night to try and bruise our fruit. Luckily, said gas dissolved into the atmosphere as the freezer was located in a conservatory with a great many window panes missing.
Anyway, this freezer sat outside my house for months. The council refused to collect it, despite us offering to pay for it, and after a few days of it sitting there, people started to notice it; so, to confuse the ordinary folk, and to get a cheap laugh, I spraypainted a sad face onto it. Due to my inexperience with spraypaint, the paint ran, but it worked well - the paint looked like tears.
Deem me insane if you will, the crying freezer is a masterpiece of art. Eventually the council took it away, and the laughter was no more. Oh, while I remember, quote me if you want a bigger picture of the crying freezer, I'll happily hand it out. Crying freezer = win.