Funny / Super Mario Bros.: The Lost Levels

• This music that you hear when starting up the All-Stars version of this game. To make and use a peaceful, relaxing, and serene track to (deceptively) invite the player into a gauntlet of rage-inducing misery is just sheer irony and guaranteed to cause PTSD in veteran Mario players.
• The Warp Zone in World 3-1 that takes Mario all the way back to World 1. When playing the game, it can be viewed as a sadistic trick put in by the game developers, but as Arin Hanson of Game Grumps commented, in hindsight it is a pretty amusing prank. (However, there is a small pit to kill yourself instead of going back.)
  • There's another one in World 8, that takes you to World 5. This time around, though, there is no pit to kill yourself, so you have to go into it... or you can just let the timer run out.
  • There's an additional insult to injury to even taking these warps: Losing World 9 access even after getting it. Losing it due to warping ahead is one thing, but this is yet another mean thing in the game.