Weird but awesome building bug.

So I was building a base for the possible server wipe, just the frame but one of the roofs have gone upside down, this lead to the idea of putting half stair things upside down on the side of the building.

Pics:
http://imgur.com/a/1z25r

Bug Abuse OMFG Reported.

This was made on my server and it is a bug a funny one lol but blue was playing fair as I see him do it

I’ve seen that happen randomly… Can you control it?