So I'm practicing dovetails, just for giggles. (yeah I do this sometimes as I don't own a DT jig) I have the pins cut and I'm chiseling out the waste, half way down then flip with an anchored straightedge board. And I'm working this like butter with a scary sharp 1/4" chisel. and I rap down and WHAMMO, a piece hits me at like supersonic speeds right in the middle of the forehead. (I was wearing my safety glasses of course. (. . . and there is no more important safety rule than to wear these; safety glasses. -NA) man it hurt, didn't break skin or leave a bruise for more than a day. but YOWZA. just thought it was funny.