O.K., the other end of your personal experience

Most of us like to remember the good items we have had, on the other side/end, what are some of the ones you have had that were from "not so special" to (in your opinion) bad?  The risk here is naming names and people getting defensive...  In the end it is just an opinion and not an attack.  

Mine:  Monster M1 cables, nearly any/all cassette decks, simply not a high fidelity format to my ears.  Early headphones from several Japanese makers.....excellent way to get a headache.