Good puzzle: connect the six boxes without crossing any lines
by Mark Frauenfelder from on (#27SSX)
Draw a line between the two boxes labeled 1. Draw another line between the boxes labeled 2. Draw a third line between the boxes labeled 3. The lines can't intersect. The lines can't go through, along, or outside any of the boxes or the rectangle enclosing them. There's nothing tricky or disappointing about the solution. (Here's the solution.)