Some fun things I found in the source code

* "TWIDDLE" [1]

    ; DO THE 2 SECOND TWIDDLE. IF TIME >= 2 SECONDS, DO A VOLID CHECK.

* "This is my employee serial!" [2]

    db '21',0,0                ;J.K. 11/8/86 This is my employee serial # !!!

* Lots os "brain damaged comments [3]

[1][https://github.com/microsoft/MS-DOS/blob/2d04cacc5322951f187...]

[2]https://github.com/microsoft/MS-DOS/blob/2d04cacc5322951f187...

[3]https://github.com/search?q=repo%3Amicrosoft%2FMS-DOS+BRAIN+...