I derive a great deal of pleasure tipping someone who leasts expects it..e.g. the counterman in the deli who prepares a big order is generally not tipped (where the server who brings a sandwich is). Thus, that counterman is really thrilled when I hand him a five dollar bill. Yesterday, in a large fishmarket, I tipped the counterman who cracked and cleaned 4 fresh crabs. Again, he did not expect it and was very appreciative. Made me feel good.