Mallam Usman lost his cheque booklet and went to bank after 2 days to report.

Bank manager: But I warned u to be careful with your chequebook mallam, cos anyone can forge your signature.

Mallam: I am not a fool. I have already signed all the cheques, so they won't have space to forge my signature..

Bank Manager fainted. ?. Remember  to put a smile ? on someone's face even without alert.