Related:

• Better leave the dungeon, otherwise you might get hurt badly.
• Read the manual before entering the cave - You might get killed otherwise.
• You'd better beat it. You can leave in a taxi. If you can't get a taxi, you can leave in a huff.
  If that's too soon, you can leave in a minute and a huff. -- Groucho Marx...
• Everything ends badly. Otherwise it wouldn't end.
• Being popular is important. Otherwise people might not like you.