Many workplaces and Government bodies nominate one day a year as Safety Day to hopefully stop workers becoming complacent about following safety rules and procedures in the workplace.
This safety poster gets attention because it says TODAY IS SAFETY DAY. But then goes on to make the point that workers shouldn't be serious about health and safety one day a year - rather every day of the year.

(Thanks to Ghareeb Hassan from Saudi Arabia for requesting and helping with this option.)