I've never seen anybody mention this one
if my manager is at a register, printing papers, filing stuff, etc. CLEARLY and VISIBLY busy. sometimes even frantically!
and I'm at the other register doing nothing
then customers still line up at his line over mine and plop their stuff on the counter
then I have to correct them and day "I'll get you over here!" and THEY get frustrated as they have to gather their items again
but I've chalked that up to the people not wanting to speak to the scary hispanic guy
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http://img.imgcake.com/LtM/1202942476287.jpg