 Tennis great Serena Williams says she once tried to deposit a million-dollar check at her bank's drive-thru. Williams on the popular Hot Ones talk show on YouTube said, quoting now, I went through the drive-thru and the guy was like, uh, I think you need to come inside for this. Although everything was above board, experts say banks are concerned about possible instances of money laundering, especially with the checks larger than usual deposits.