Wear a hat

Common parlance in England for wearing a condom

Man 1: Oy! That one's a knock out.

Man 2: Don't matter how pretty she is mate. Always wear a hat.

National Wear A Squid Hat Day

On May 8th you could wear a squid hat to maybe get some laughs or maybe get some strange looks but it's all just for fun.

Dude 1: *Wearing a squid hat*
Dude 2: Why are you wearing a squid hat?
Dude 1: Because of its National Wear A Squid Hat Day
Dude 2: Oh cool *puts a squid hat on* now we are both wearing squid hats