Since I was very small, I wanted an oscilloscope.
As a child in the 80s, this was a nearly impossible want. New ones were unthinkably expensive, while used ones were rare in working condition. I eventually did get my then tiny hands on a clunky, heavy, rack mounted unit with a screen the same color as Thai iced tea. It never worked, of course, but I didn't figure that out until years later. Eventually, it ended up in the bin with a lot of my childhood things.