You know what I hate? When a fights breaks out over a toilet on a nuclear submarine so a serviceman pulls out a gun and begins shooting. I really friggin hate that (especially on a nuclear sub). Everything was going just dandy on the HMS Astute until able Seaman Ryan Donovan allegedly desperately needed to go to the toilet. Unfortunately he was ordered to let a visitor go first.Hmm, in hindsight not very smart. The sailor grabbed a SA80 assault rifle and shot dead a Royal Navy service person and left another injured.It is also being reported that Donovan didn’t want to go back to sea and begged to be allowed shore leave.