Coincidences in numbers

So, I'm standing in line yesterday morning, pulling out my money to pay for breakfast. As I do, I look at the serial numbers on two of the bills I had. After I notice a trend in the letters of the serial numbers, I pull out the third one.

JH

JK

ME

Okay, those likely mean little to anyone but me, but those are the initials of my two best friends growing up, and me (as ME, not as my initials, clearly). I have to say, I am amused by this.