When your characters need to see what's going on in that room over there, but they don't quite wanna risk coming all the way out into the open...
...when your characters all want to see rather than just sending one person to check so s/he can come back and tell the others, what do you do?
The Scooby Stack! We've all Seen It a Million Times in cartoons and comedies: one head pops out from behind a [...] [tvtropes.org]