Bonus LOL: this is where it leads if you open the EXIT in a movie theater.
The 'sorry' addition is what is funny about this sign. Signs are designed to state information clearly and professionally and the 'sorry' gives the sign a human element that is uncharacteristic. JOKE EXPLAINED.
Great, now they are going to have one of those signs there for the next 50 years.
This sign is less funny and more a statement about how much the sign owner values sarcasm. JOKE EXPLAINED?
This sign is funny in that it states the obvious problems associated with a sign advertising a temporary issue. JOKE EXPLAINED.
This sign is funny because a warning of this nature is largely superfluous. JOKE EXPLAINED.