So, here's the one I got the other day looking through logs on a crazy multi/puzzle cache.
This is a double five-star cache which required me to squeeze my 6'4, 250lb frame into a very small area of a sunken airplane and search in zero visibility silty conditions for the object required for the puzzle to find the second stage. This actually made me think way less of all the cachers who were in this group, it's a five-star terrain for a reason.