One of my favorite things about a comic story is when a writer takes a well established ability of a character, and manages to do something really interesting with it. Examples include Thor using mjolnir to catch a falling bus by generating a tornado beneath it, or the Atom flipping a criminal that had grabbed him by suddenly taking on his full weight and screwing with said criminal's center of gravity. There's nothing being done that's not within the established parameters of the power, it's just being used cleverly.
There are some characters with abilities that never seem to get that treatment, even though their powers have immense potential. One that sticks out to me is Mister Miracle (and all the New Gods actually).
Anybody that can open a Boom Tube has a pretty dreadful weapon on their hands if you think about it. Imagine opening one right in front of someone with the other end at the bottom of the Marianas Trench. Or in out in deep space. Or just above the surface of the sun.
What are some other powers that have interesting or dangerous implications that we just never see?