One thing I find EXTREMELY frustrating is that instructions are written for those that are right handed and the last sentence will say if you're left-handed do the opposite. That makes me crazy because sometimes I need to read directions over and over which means that I have to read and reverse, read and reverse, read and reverse.... sometimes pictures are involved, how easy is it to reverse a picture in your head!! I have learned to look at pictures in a mirror which helps.
Oh and scissors that are supposedly universal AREN'T.
If you draw a line and try to cut on the line you will be @ 1/16 off.