Common Tropes in Quake and custom maps/mods

Two terrible links as hint what this is about:

http://en.wikipedia.org/wiki/Trope_(literature)

http://en.wikipedia.org/wiki/Fantasy_tropes_and_conventions

Not sure if normal common gameplay setups count too, eg monster closets, spawning in the player's back, repopulating the map before sending the player to backtrack etc

• A horde of zombies right before the player gets the grenade launcher
• Moving platform over lava
• Seeing a pickup behind bars or otherwise unreachable at the moment
• Red demon face texture shooting nails
• Putting stuff/secret behind the player at his spawnpoint