Within each of our lives, there are one or two (at least) people who deserve a smack in the face, but societal norms dictate such acts to be inappropriate. Rude, even. And when the "I'm squishing your head!" trick doesn't work, there are truly few options left.
In Singularity, if some jerk got in your face, the Time Manipulation Device (TMD) gives you the power to either revert or age them. Reverting a living, breathing human would devolve him into a mindless creature of primordial quality; aging someone essentially reduces his physical body into dust. The choice is yours, really.
The TMD also works on inanimate objects, capable of reverting a rubble into columns, buildings, even an entire ship. Previews have shown us that reverting a smashed crate and then breaking it again can yield items. Really, the possibilities are endless.