Sometimes it can be taken to indicate at least a minimal level of genre savviness, for example, in situations where splitting up means that one group will later have to go find the other group. It's also a clear win in horror films where the monster/killer will pick off each member one by one.
At other times, it's clear proof of Genre Blindness; if there's only one Big Bad, and the group is running from it, staying together means that the whole scene becomes the punchline of a joke: "I don't have to outrun the bear, I only have to outrun you." Additionally, staying in a group in that case makes it much more likely that when The Millstone trips and falls, they'll wipe out at least one other person as well. In this case, it might be deemed safer to apply Let's Split Up, Gang!.
Anime & Manga
Comic Books
Fan Works
Live-Action TV
Music
Stand-Up Comedy
Web Comics
Web Original