Wife: Honey, why do you say that today is "programmer's day"?
Programmer: Because today is the 256th day of the year, or "day 255" if you start counting from zero. In binary it can be represented by one byte, which has 8 bits. Also, it's 2?, the highest power of 2 which is less than 365. And also 256 is 100 in hexadecimal...
Wife: Oh, I got it... It's numerology...
Programador: PLOP!
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T-shirt: 0x100