This is one of the oddest stories I've come across Decatur County Courthouse built in 1870 soon showed the presence of some sapling growing out of the roofing, so they cut them out (as you would) but then in 1875 another sapling appears growing away and this time is left till 1929 (1929!!!

what did all the roofers go on strike WTF???) Anyhow in 29' this small tree dies only to be replaced by more saplings in the roof, so and so on and so on...don't believe me.....
It really is wierd, now they even have a festival, tourists come from all over to see the tree...check here to view a range of photos from the 1890's onwards
http://my.voyager.net/~mfhaston/GreensburgIN.html
Really is the strangest thing...so next time you see a crap roofing job think on maybe the plumber is just trying to get another tourist attraction started!
