You never know what you might find in the walls of your home. Matt Streatfeild of Australia was renovating his home when he found a message in a bottle concealed between two walls. He found a glass milk bottle, and inside was a note signed by four construction workers who built the walls decades earlier. The note is dated April 5th, 1974, and lists the workers who completed the project and explains the job was among their first after converting to the metric system. Streatfeild posted the note to Facebook, and was later able to get in contact with one of the workers who authored the message. He also says he plans to return the bottle to its former spot when the renovation project is complete, along with a message in a bottle of his own.