Vibrating baby chair. It was the day Chelsea beat Villa 8-0. I was operating on a couple of hours sleep. I just couldn't do it. I put a locking piece in the wrong way round and had to break it to get it out. Sweating, fury, swearing. Awful.
I bought a second hand Cozy Coupe as they are supposed to be incredibly difficult to put together.
Flat packed furniture is a breeze in comparison.