Notes:

If your a henchman of his.

Let's just say if you work for a man like the Joker
Chances are your going to push one of his buttons accidentally
And you will die a quick painful death.

But there might be some things you can do
to avoid activating his urge to kill.

1: Don't ask him a ridiculous question like, what are you talking about boss?
He will likely shoot you for interrupting his train of thought, feed you to the hyenas
Or maybe he will do it just for the heck of it.

2: don't try to act flirty with his hench girl Harley Quinn
He hates it when someone tries to take her away from him
No matter how badly he treats her.

3: don't ever try to or kill the batman yourself.. that's his job
If you do that he may just throw your sorry butt in the path of a train or a moving car
Or something much worse.

4: Joker might flip out if you do something
as simple as handing him the wrong weapon… Or ironically saying he's funny.

:5 Don't be surprised if Joker wants to end you if you breath the wrong way
He will use any excuse he wants to if he does that.

6: Hurting Harley?… it's your funeral
Only he is allowed to do that.

:7 Joker might kill a henchmen just for a cheap laugh
So if he calmly offers you a handshake or a cigar after you've p----- him off or not.. Run like heck.

:8 If your a very good henchman with plenty of competence
Joker might find you useful and let you live.. Until he's had enough of you.

:9 You want to quit being his henchman?
just don't say it right to his face or threaten him
Try to sneak away when Joker and the other henchmen aren't not around..
It wouldn't recommend doing it however Joker always has ways of tracking people down
Just ask Harley.

:10 Joker is almost certainly going
to give you a dose of Joker toxin if you mock him and no amount of sorrys will change his mind.

So in truth you'd never want to be a henchman of the clown prince of crime,
Your better off working for two face or the penguin