Port and Starboard
PS
Port = left = red =       Starboard = right = green =
Private Secretary
Cartoon 		PostScript to a letter or note
Hi John,

Please look after the house while we are away.
You may invite your friends, but please don't make a mess !

Dad.

PS
And don't forget to feed the cat.
Says Sherlock Holmes :
"Is there any red port left in the bottle Watson ?"