This sign is less funny and more a statement about how much the sign owner values sarcasm. JOKE EXPLAINED?
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.
This sign is funny in that it states the obvious problems associated with a sign advertising a temporary issue. JOKE EXPLAINED.
This sign is important, but it is humorous that this weird problem is so pervasive that a sign needs to be created to address it. JOKE EXPLAINED.