I had a fun Google Wallet situation at a gas station a few weeks back.
My wife and I were on a short vacation, and we needed gas. I pull up to the pump, ask my wife to pump while I walk into the store and get drinks and snacks. I forgot I handed my wife my wallet earlier, so all I had on me were my car keys and my phone. Rather than braving the weather, this was about a month ago and was hot outside, I got the genius idea to use my GN. The lady rings me up, and says "$7". I hand her my phone. She looks at it and then at me clearly confused. She made a joke saying she thinks my phone is worth more than $7 or whatever the total was and that she only accepts cash or charge (perhaps some others I don't remember). I say, "You have Google Wallet support here *pointing to the sign* you just put my phone on that, *point to their NFC* and it should complete the transaction." She still had a super confused look on her face, that was slowly transitioning to a scared look of sorts. I think she thought I was trying to rob her with my phone or something.
To make the situation a bit better, as she is standing there holding my phone trying to figure out what in the world is going on, my phone vibrated. My wife was calling, attempting to tell me that I had left my wallet in the car. "Duh..." The clerk definitely wasn't too sure about putting my phone anywhere near the cash register, which is where the pad was.
So I tell the clerk I will go get my wallet from the car and pay another way, it isn't a big deal. I grab my phone walk back out to my car, get my wallet from my wife. On my way back, I notice the lady is on the phone and looking at me still with that kinda horrified look. As a person that always thinks the worst of things, I am thinking she is calling the cops. I am envisioning cops showing up to arrest me, for trying to rob the convenience store with my phone.
Fortunately she wasn't dialing 9-1-1, she was calling a man, whom I assume was her boss. The lady puts the phone on speaker phone, and her boss apologizes to me. He tells her to take my drinks off of the transaction for my troubles. He then tells her how to complete the transaction. The lady starts laughing a bit, as a sight of relief. She confesses to me that she really did think think that I was trying to do some sort of theft. And that she did think about calling the cops. She said that if the boss hadn't answered the phone, she probably would have phoned the police.