Looking for a personalized photo-related gag to pull for Halloween this year? Look no further than this head-in-a-jar prank. It’s quite easy to pull off and doesn’t require too much time or money. This idea is by Mike Warren, who regularly posts crazy project ideas to his Instructables account. The basic ingredients of the prank are a print of your face, a large glass jar (free of designs on the surface), and some food coloring. There’s one step that will take a bit of know-how: creating the print itself. You’ll need to photograph your head from three sides: left, head-on,...