How about haircutting?
I leave around $4.00 for a 15 dollar cut.
20% for food
$3.00 for the pizza delivery person. More if I get a couple.
$10 for hotel maid service.
Only once did I ever give a lousy tip and that was for blatant service boobery. The amount was ok 15% it was just in dimes and nickels.
I never know what to give the valet person. $2.00 - $5.00