Weird assumptions in published Adventures.

[Lindeloef]

*Warning this thread may contain some Spoilers*

Any weird assumptions in published Adventures/Modules you encountered (as a Dm or Player)? Something the adventure assumed the party to do in order to solve a puzzle or situation that was so asinine the players (most likely) would never get the real solution?

An example I have encountered:

In an "the dark Eye" (das schwarze Auge) adventure, our group had to find a well. Around the well there were 4-5 Statues each having an Instrument in their hands, except for 2 of them. So we had to find the lost instruments. One of them was encased in some sort of Crystal that was harder than Diamond. The written solution to get the instrument out of the crystal was to "Remove one specific instrument from the Statues at the well and play it next to the crystal". No hints for this at all. (Luckily our DM handwaved it so we could destroy the crystal by force)

Another that comes to my mind:
To get a specific item to survive the next room, we needed to desacrate the grave inside the tempel of the god of death. The Highpriest's grave. Nobody in our group even thought of that.

So what stories do you have?

 

[Wednesday Boy]

A module we played in had a room that could only be entered into backwards. It probably wasn't that difficult of a puzzle but when we tried throwing objects through the doorway, our GM rolled randomly to see if the object flew through the doorway backwards or not. He wasn't trying to be purposefully malicious but it made it difficult to recognize a pattern in our trial and error efforts.