The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
I think you meant hyperbole (exaggerated statements or claims not meant to be taken literally) rather than metaphor (a figure of speech that implicitly compares two unrelated things, typically by stating that one thing is another).
If it was a metaphor then you would be saying have a coronary...