Whats the best, and most unique weapon and armor perks that you've come across?

Most seem to be pretty simple like charisma boost or some sort of percentage increase on a stat, but some seem to be not as obvious.

For me, the best weapon one is double bullet, which actually only consumes one bullet but basically does double damage.

The best armor for me has been one with "enemies have a harder time detecting you when you are sneaking and not moving"

If you crouch and stand still you go invisible. I didn't see that one coming

Martyr effect for me, slows down time when you reach under 20% health. It's a real lifesaver.

Wow did you get that on armor?

Deep pocketed anything + ultra light chest piece. Keeps your weight next to nothing.

Also, just about any hat as well as any clothing + MK5 Ballistic Thread is amazing. It opens up the rest of your armor to do whatever you want because you don't have to worry about maxing out your resistances.