You guys got some weird definition of 'climactic'.
If your adventure consisted ass-picking followed by finger-sniffing, then no dramatic climax was forthcoming and therefore no anticlimax was possible.
In the other extreme, if you put everything you had on the line and lost it spectacularly, that was the climax. The anticlimax would be a detailed description of how the peasants divided up those valueless trophies you didn't have the taste to throw away on your own.
EDIT: One of my anti-climactic deaths: Before I carried around a pick to dig impromptu shelters in case of boogeymen (like I'd ever have the sense to use it for that,) I thought I could just build a support and then a floor on top of it, and technically be inside. And that truly does work, provided you have it constructed.
Well I got stopped by cacklers in the middle of nowhere, and I believed I could take them, but I started setting up my provisional panic room just in case. By the time the support was done, they were already on me and cost me an ear and a finger. I was pretty well skilled with the iron dagger I had, and on a good shot it can cleanly bisect them, but it still took over 10 mins of scrambling around them to stay out of their multiple attacks, let my bleeding slow and my moderate stamina recover, and still try to get good strike opportunities.
After I knocked the last one and caught my breath in the golden silence of the night that remained, I returned to my support to complete the shelter over my head. But building a support is a two stage construction, and if you haven't completed the second stage, then you haven't built it at all. So I successfully built an unsupported floor tile over my head that predictably caved in and obliterated everything where I stood.