I love (gag) Radio Shack. I walk into the local one, and after .8 seconds:

Anxious salesperson: Hi! Welcome! What can I help you with?
Me: Um, I need a reverse polarity SMA male bulkhead connector.
Not-as-anxious salesperson: blink
Me: A connector for a wireless antenna?
Now-confused salesperson: blink
Me: Ya know, for a computer? Wifi?
Regrouped salesperson: Oh, we sell lots of wireless antenna extenders!
Me: I just need the connector.
Realizing-they-cant-help-me salesperson: No, we dont carry that.
Me: Hm. Oh well, ok. Do you guys have any outdoor speakers that are weatherproof?
Once-again-anxious-salesperson: Yes! We have those! Follow me.

Walks over to the speakers.

Not-as-anxious salesperson: Oh, looks like we’re out of stock.
Me: Ok, that’s it for me then. Thanks.