These beach Jell-O cups are ridiculously cute and so easy to make! With blue gelatin, crushed graham crackers, and teddy ...

It’s been less than a week since McDonald’s began selling adult Happy Meals with collectible cups, and already the drinking vessels have become a hot commodity on third-party e-commerce platforms.

One involves red solo cups and party favours and has simple rules, so anyone can get involved. READ MORE: 'I found super-rare item in attic – it's worth a fortune and you might have it too ...