On a Friday, two hours to bank employees were in the safe when organizing a values by a technical fault they were locked up there and no one noticed their absence.
they were scared, worried, but soon calmed down and sat down.
one gets the calculator and do some calculations and tells his friend:
-I have good news!
-according to my calculations, with the air which is inside and the air we breathe it will last until Monday when they open and out of here!
and the other says:
-I have bad news:
-The second is a holiday!