Double Fling Glitch
Well, here's a video:
Being in contact with any solid collision (like a floor, ceiling, wall, or another gooball of any type) is enough for the game to let you grab it and try to fling a flingable/launchable gooball (Bit and Pilot) again, even if it's in midair. You can also do it re-grabbing immediately after launch from the ground, or even from a goo structure, though the latter is incredibly hard.
This can lead to some... ...odd effects. For example, while aiming a midair Bit or Pilot, they won't die to mostly deadly collision or be able to be sucked into a pipe. You can see an example of the latter nearing the end of the video. Pilots also have some additional effects.