So generally I use turn signals correctly. But there are a few times I don’t for particular reasons.

If I am sitting at the rightmost lane at a busy intersection and intend to turn right, I honestly tend to not turn on my right turn signal. The ambiguity of whether or not I’m turning or going straight helps keep assholes behind me from honking at me. I’ve found that an unfortunately large amount of people get impatient when someone in front of them is turning right on red onto a busy road. They honk and act like assholes because they want you to dangerously jump into traffic and not wait for a clearing so they can go sooner.

I know I could turn on my turn signal and just let an an asshole lay on their horn, but honestly I really truly prefer to avoid that.