Weird Birthday Card.

So, I was in a card shop today looking for a funny birthday card. And all of a sudden I came across THIS: [URL=http://imgbox.com/5WgKw8I2][IMG]http://t.imgbox.com/5WgKw8I2.jpg[/IMG][/URL] On the outside (has you can see) it says "2 Rules in Life: 1-Neverdrink on an empty stomach". And on the inside it says "And 2-Never fart in a diving suit. Happy Birthday!". I must say I was a bit surprised seeing this, because it's the first time I've seen anything referenced like it in any card.