Joke 9: The Inner Voice

One day a guy hears a mysterious inner voice. The voice tels him:
“Withdraw all money from the bank!”
He obeys the voice and withdraws all money from his bank accounts. After that the mysterious voice tells him:
“Go to the casino!”
He goes to the casino. The roulette, black jack, one armed bandits... the whole deal. He doesn't even get a good look and a new command of the voice is here:
“Go to the roulette and put all the money on 13!”
He does that. The roulette is spinning and spinning and when it stops... 12.
The mysterious voice:
“Damn!!!”