Actually, it's my fault.
Seriously.
In the early days of Air Warrior (1987-1988) the game flew in half-time. This was because we played over 300 baud modems (you remember modems, right?) and you just couldn't send enough update information over that pipe to do the simulation in real time.
Well, that means that the normal climb to 20K could take 15 minutes or more, depending on your plane. So we had time to kill. One night I just started telling jokes and there were some sheep jokes in the mix. I can still remember one of them. In those days we ran on GEnie, so something as off-color as sheep-shagging was noteworthy. For whatever reasons that incident somehow because lore for AW, then WB, and now AH.