Really, at this point just go the extra inch and add the 's.
I got bored at "S"
They knew they wouldn't survive the ice blizzard, but it was just too good to go inside.
Just add an apostrophe s after everything. Why? Because the lord himself told me to!
"Really bored while driving from S. Carolina to CT in the rain."
How offensive. Everyone knows the possessive 's' requires an apostrophe!