You can become invisible
Name a superpower, but the comment after is the consequence(s)!
but you have 1 day left to live because of a brain cancer that cant be removed because it came from martians on mars who developed a special type of disease to eradicate humans and then the martians will colonise earth because mars is dying because of radiation from the suns uv rays which actually also came from the martians
For example:
You can fly.
Next comment:
But you're afraid of heights...
Have fun!