According to the best school playground scientists of the time, opening a packet of crisps upside down (i.e. so the branding/writing is upside down, and you open the bottom of the packet, at the top) actually "made you gay".
It wasn't just gay if you did it, but it would literally cause a spontaneous eruption of gayness in whoever did it - who would be permanently gay from that point onwards.
Black cats of all nationalities are welcome :) The charity that declared the day is from the UK, but the idea that "black cats are beautiful and shouldn't be overlooked" is worldwide :)