Our group were gearing up to get food for the next boss, and found that we had a large stash of wolf meat, but had run out of mushrooms to go with it. One of the team volunteered to go forage for some. Considering they are plentiful in the meadows and black forest, it's not like we needed to make it a group outing.
20 minutes later, we hear him over the voice chat lamenting that he hadn't found a single one on his entire trip. We even pinged places on the map where we had seen them before. 20 more minutes later, he had found just one.
It was only at that point he suddenly asked: "Say… what colour did you say these mushrooms were again?"
"Red"
Then it clicked… We had just sent our colour-blind friend out, alone, to find red mushrooms within a verdant landscape of green. Oops.
Source: https://www.reddit.com/r/valheim/comments/usahcn/confession_time/