Is this e-mail a scam?

I know this isn't an orthodontic post, but I have to get a few words in about this.
We all get e-mails that sound threatening.

• Your account will be locked. 
• You must update your information or you will be unable to access you bank account, 
• Update mandatory

No one wants to lose the privilege of using on-line accounts, but how do you know if that e-mail is a scam? I make a quick video of how to evaluate that e-mail.