Worst possible nut or bolt to remove

[ORCoaster]

Over the last two days I have been trying to get some of the parts and pieces I have picked up here and there in the caddy.  I had a new dash panel, a cluster with a recently converted tach, Thanks Libby for the help on that.  I also picked up a new momentary switch to use as a starter button.  The front speakers I got from a guy in NJ came with cut out brackets and I really wanted to get the tunes done and move on to the other parts.

So here is the problem, I needed to get access to that 7mm bolt that is also holding the defroster channel in so I could swap my brackets with the customized ones that made the speakers sit down in the hole.  I see so many of those front speakers without covers and I didn't want that.  I believe that trying to get to that bolt is the absolute worst for any on the VW.  I didn't want to remove the dash, I pulled the two screws and moved it out a bit but to get the head of the bolt was done with a wrench one partial turn with a wrench flip then another. 

Continue that until it was loose enough to get a finger on and spin it.  That is easier for me to do with the right hand as my left has been through a table saw in the past and the finger and thumb are there but have dead spots.  I can't really tell if I am doing what needs to be done when using them if I can't see them. 

So my question is not if anyone has done this before but is this:

What is the worst bolt or nut you have ever had to remove to do the job you needed to get done?

I have most of the parts back on but the torrential river of water pouring on me today cut me short.  Radio sounds so much better with 4 speakers working. 

[fatmobile]

 While we are talking about Mk1s.
A couple bolts I dread are the ones holding the AC heater fan cover on
in the raintray.
For the one on the right I've been able to wedge a wrench in under the foam under the dash.
And hold  the nut while I unscrew it from the raintray.
The driver's side needs 2 people, even if it's just the neighbor kid, ha.
 I should look for a set of rivnuts or something for next time.

[Rabbit79]

Well.... If you're not restricting to just V-dubs, I can remember clear back to when I was in the Navy working on the Grumman A-6E Intruder attack aircraft. We had to change a little electronic box called the 'stab position transmitter'. It was clear back in the tail of the airplane and you could only get to it through a small access panel. It was only held in by 4 screws but you had to be a circus contortionist to get to this thing. Took me and another guy 6 hours to get that thing out. That was one of those cases where you swear they started with that little box and then designed the entire airplane around it.