My two are similar, but at opposite ends of the spectrum. The first was putting up with an a-hole boss for nearly 10 years. Shoulda knocked his lights out years before but argued with myself that I needed the job, which, btw, stunk.
The second was actually knocking the lights out of my a-hole boss. I shoulda just told him to stick it - instead, I broke his jaw, knocked out two of his teeth, and broke his nose. All in one shot. It was epic.
Thankfully, he took the first swing, flailed and failed, and I had witnesses, so I didn't end up getting sued. I did lose my job though, but in hindsight, it was ok - it stunk. Turns out that a few years later, the guy they hired to replace me pounded him almost as bad, so I guess for once it wasn't me...lol.
J