As the title says, please share experiences in your everyday
life that make you want to do a facepalm.
I'll start.
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Yesterday the FS asked me to tar pau a few milkshakes from
McDonalds' for her family.
So I ordered the three milkshakes at a nearby McDonalds' and
told the counter girl that I wanted to 'take away'.
She poked the straws through all the milkshake covers. Now that
is dumb, because that would increase the chances of spillage while
I'm carrying the milkshakes. So I told the counter girl:
'Please replace the covers and don't poke straws through them,
because I need to carry them over a long journey.'
So she took the three milkshakes away, and I happily assumed
that she would simply replace the covers.....
..... but to my horror, she made new milkshakes and
threw the original ones away. I only realized this when
she made the third new milkshake. 
*facepalm*
mcdonald got certain SOP to follow about how they handle food.
So i believe she is just simply following SOP. Rejected food item
are to be replaced with 100% new ones.