Some wait staff make it difficult to tip them.

The other night my wife and I were out doing a few errands so we stopped for
a sandwich at a chain type restaurant. The bill for the twoof us came to
$17.50 plus tax, or $18.63. An appropriate tip would be about $3.00 to
$3.50

I reached in my pocked and had some twentys, two singles and a five. I put
a twenty and a five in the check folder. The waitress asked "do you need
change?" and I replied "yes" She took the money and came back a little later
with a few coins, a single and the $5 bill.

So. . . . . . Instead of getting a $3.50 tip, she got the two singles and
some coins. The place was busy and she disappeared. I did not feel
responsible to wait around and chase her for more change, but she would have
had more in her pocket at the end of the night. I thought a good
waiter/waitress always made sure the customer had enough bills to leave a
tip. I did not feel it worth $5 to bring a sandwich and soda.