Except paper clips are steel, which does not suffer from cyclic fatigue like aluminum, but does fail when pushed past it's limits, like bending it 180 degrees multiple times. There's a reason I replace my aluminum seatposts and handlebars on my bikes fairly frequently but don't worry about the titanium seatpost nearly as much. Nothing worse than a snapped seatpost saying hello to your posterior.
I guess bad example. But yeah, aluminum fails spectacularly when it does. Surprise bunch biopsy of the prostate is no fun.