It's a variation of the classic phishing scam that works by persuading people to supply their bank details, which are then used fraudulently. Michaels' staff say in a statement: "Someone saying they are Bret, and that they need help transferring a large sum of money.

"They ask that you do not share the phone number they give you, bring it to management's attention or tell anyone about their texts, as they need the information to be confidential.