I have one doctor who consistently prescribes Viagra for himself. And by the quantity he's going through at age 36 I think he's out to set a new record or something. I think he's a little embarrassed though because he's always wearing Unibomber sunglasses when he comes in. Sometimes I've seen him out in the store with a fluffy little dog-- apparently that's great trolling material. I'll let you know how that goes when I get my fluffy little dog.
But the one guy that really pisses me off is a fertility specialist. He shows up at the craziest times demanding antibiotics then quibbles with me about the price. The last time he was in I reminded him that he had the same antibiotic just recently. He said it was ok, so I filled it. Then after he paid he leans over the counter and says in a whisper, "It's for my wife..." What? Now you're lying to me? Oh my gosh! Get out of here!