Why are tricks part of Halloween?

For most of the year, playing pranks on loved ones and neighbors may not be met with open arms. But attitudes tend to relax on or around Oct. 31, when millions of people celebrate Halloween. For some celebrants, Halloween is as much about tricks as it is treats. But why are tricks even involved with Halloween? According to Smithsonian.com, the tricks played on Halloween can be traced to 19th centu…