xkcd is an inspiration to us all...
A couple of days later, I stumble across this:
Inspired by XKCD: MBR Love Note
Just a note: if you plan to mess with that, do keep a copy of your MBR (you might actually want to copy a bit more than 512 in this case, go for safe MB, then you can restore how much is needed from that).
dd if=/dev/yourdisk of=mymbr bs=512 count=1
You can later restore that to disk
dd if=mymbr of=/dev/yourdisk bs=512 count=1
-----> Cool :D
Note: In response to the comment by Criveti Mihai, the binary for the MBR sector actually is in the zip file at src/love/love/mbr.bin .. except if you were to install it via DD, you would need to install a message on sector 3 as well.