A non-hack I learned about yesterday. I was taking apart an IKEA dining room table. The screws and bolts were obvious, but the top would not separate from the frame.

After much parsing of the assembly manual (which took some effort to find online since they don't make this model any more), I realized that the top had slid over a knobbly dowel. Pulling horizontally popped it off.

I Sharpied the directions on the bottom before I reassembled it. We'll see if far-future me can figure out what I meant.