That reminds me of this one!
A lady is passing a pet shop when she sees a frog in the window with a price ticket saying £100.
Wondering how a frog can be so expensive she goes in to ask about it.
Well says the shopkeeper' this frog gives you oral sex on demand'
You just strip off and put the frog 'down there' and it gives you oral sex!
The lady pays for the frog and takes it home.
Next day she is back to complain the the frog did not 'do it's stuff'
The shopkeeper says that's strange I've never had a problem with a frog before,I'll come back with you and see what you are doing wrong.
So they go back to her house, she strips off and places the frog between her open legs. The frog does exactly nothing. The shopkeeper turns to the frog and says ''OK,This is the last time I show you what to do!''