Just made this up on the spot; basically you think of random things you can't use a flip to do (this includes stuff like kickflips and stuff on skateboards and the like; don't assume I just mean flips from a standing/running position)
Example: You can't use a flip to boil an egg.
Example 2: You can't use a flip to fly a plane. (You can make the plane do a flip but just you try doing one in order to fly it)
etc.
I'll start:
You can't use a flip to open a box.