Meanest way to reject someone?

What is the meanest way to reject someone like totally shatter their heart and for them to take at least a month or so to get over the rejection
+1 y
just to update the question. She did ask if I wanted to date her. I couldn't get too harsh :( and just told her that she is not the type of girl that I would date. However I do hope that someguy one day would have the 'balls' to do a very harsh rejection towards The 'pretty girl' a high school crush, that did a harsh rejection toward him before.
Meanest way to reject someone?
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