Why, it's where the plot is of course!

The deranged, sleep addled plot.

Misread that as "sheep addled" because I had my cursor over the word sleep.

So, todays topic may be "times simple misunderstandings had far plot affecting consequences further down the line."

The only one I can think of is that one of the early GMs I had, consistently had the "hands of the king" at any monarchy we visited be a gigantic magically empowered hand that would do the talking and be the interim between the party and the monarch. Even after he learned that it was a political position and an actual person it'd become a "thing" with our group, so there was no change.

Didn't exactly become a major plot point, but we have a joke in our group that spawned when our Sorcerer said he wanted to "Feel dem rocks" (As in actual rocks). Our GM decided to throw a Stone Golem at us later on.

a giant sentient hand sound awesome, i would have decided to stick with it as well.

It's fog. fog everywhere. this way i don't have to describe.

remind me of a time where i told the players that they where in a really dark Area, so that i could gain a few minutes to find my notes.

Don't do that, they'll just attack the darkness.

Sounds like an easy way to drain the group of a few magic missiles.
Up next is a gazebo.

Well, here, of course. A good pirate ALWAYS knows where they are, even if the relative position of everything else is unknown.