Perhaps the worst ones are the ones that just show pictures. Hopefully, they’re numbered, but too often the line drawings don’t closely enough resemble the bits and pieces scattered all over the floor. I had to assemble a kid’s toy about a month ago, and it took a lot of flipping and rotating the pictograms and the actual objects to figure out what was what. The box didn’t even have a color photograph (or B&W photograph) of what the finished toy was supposed to look like!