I don't take anything from the room—that's a dead giveaway.
Also the big hole in my head is a dead giveaway.
This is pretty much a dead giveaway that the address is not what it appears to be.
A dead giveaway is if you get an email "from" a financial institution where you don't even have an account.
Unpackaged, unprotected eyewear, or eyewear in plain plastic sleeves, is a dead giveaway.