Or wish that he didn't know math:
Genie: you can't wish for more wishes
Me: I wish you where terrible at math
G: ok
M: how many wishes do I have left?
G: 14
Genie: here 30 lamps!
Me: yes!
Me: *rubs the lamps*
after I rub the lamps no Genie comes out
Me: how come no Genie comes out?
Genie: there just normal lamps. what you wanted lamps didn't you?