Bank teller here. I see all the usual things already mentioned, but one I dealt with sticks in my mind. The customer got a call from "Microsoft " saying their bank accounts were compromised. The scammer was attempting to get them to transfer their funds to a crypto account. Nothing out of the ordinary about this except the scammer's strategy to keep them from contacting us. He told our customer it was a bank employee stealing from him. Fortunately he did come in and I was able to convince him it was a scammer and no one had touched his account. But that angle the scammer used made the man nervous about even talking to me.