Edna bending the laser beam
The scene when Edna bent the laser beam really made the hackles of my neck stand up the first time I saw it.
It's so simple as a visual effect, but there are only a couple ways Ellen Burstyn's character could have achieved it in the real world.
1. Manipulate the density of the atmosphere in front of her hands and create a free form gaseous prism to deflect the beam.
2. Manipulate the gravitational constant within a localized area in front of her hands and create gravitational lensing to deflect the beam.
The former explanation would describe the ability to manipulate matter on a molecular level.
The latter explanation would mean a absolutely super scary ability to manipulate the fabric of time and space itself.
Either way, I think the character Edna had a lot more ability beyond healing than she realized.