Did you think Mind Your Language would let April Fools' Day arrive without reminding you about how to punctuate it? More fool you.
Picture: Found Animals
The correct version is April Fools' Day, with the apostrophe after "Fools". The day is "owned" collectively, not by an individual fool, so the rule here is different than for Valentine's Day.
If apostrophes make your head spin, check out our detailed guide on how to use them. And remember: if you're writing something designed to fool friends or colleagues tomorrow, don't mess up the spelling and grammar. Accuracy matters.
Lifehacker's Mind Your Language column offers bossy advice on improving your writing.