How to get out of giving people a tip (the money kind)

To avoid giving that extra bit of money:

Such people as delivery, pizza, chinese, etc:
Give them the regular money then have a spare purse or wallet lying around. If you have a small child or dog, tell them to have fun tearing the empty wallet apart. The deliverer will see this is a bad time.

Restaraunts or people at public pools who bring towels,etc:
Pat impatiently all around body 'looking for that bit of money'. If the perrson doesnt get immpatient, flirt with them a bit (even if its the same sex...or for some people, the opposite sex). They will get uncomfortable after a while.