Silent Blow Job !

A lonely felow treats himself to a new blow up doll. inflates it, and thinks to himself, ill go down the pub and have some fun when i come home, . on returning to home he sees the doll has deflated, so in the morning he calls the shop owner " exvuse me,this doll you sold has gone down on me ,. " the chap on in the shop says " kin ell, if i had known that id have charged you double " !