In all the five seasons they have done of this show for me they haven't made a bad episode.
Elementary Season 5 Ep 11 "Be My Guest"
That was one fucked Ep and why this show goes from strength to strength not one bad Ep in its five season run so far.
Elementary Season 5 Ep 15 "Wrong Side of The Road".
The two scenes which cracked me up one this guy has a gun hidden up some where at the start of the Ep and secondly when Sherlock finds out Kitty has a baby son he was frozen on shock, I love this show
The Show has been renewed for another season.