A customer walks into a pharmacy and asks assistant for an 
anal deodorant. The assistant explains that they don't stock 
them. The man insists that he bought his last one from this 
store. The assistant passes man on to the pharmacist, who 
explains that store has never stocked such an item. The man 
explains he bought his last one from this store only weeks ago
and has done for several years. The pharmacist asks man to 
bring in his last purchase and he will try  to match the product.

The following day, the man returns to the pharmacy and shows 
the deodorant to the pharmacist. The pharmacist asks why the 
customer thinks this is an anal deodorant, when it is obviously 
of the underarm stick variety.

The customer explains that instructions on reverse state, "Push 
up bottom to use."