re: Game of Thrones S4:E2:"The Lion and the Rose", HODORS ONLY (no book readers)

The question is an odd amalgam of who benefits and who has nothing to lose. Who has motive?

Do the Tyrell's have anything to lose by killing J? No. Marriages are born of benefit. The Lannisters need the Tyrells. J dying doesnt change that. This could be crazy, but Margaery is young. Tommen will be of age to marry in a few years. Could she be handed off? Tyrells still get their queen and a claim to the throne. Additionally, they get rid of crazypants Joffrey. How long would it be until Joffrey either killed Margaery or sparked an outright rebellion and lost the throne?

From that perspective, it doesnt seem absurd for them to be the culprit. And I still believe it was a plot hatched with Tywin.

as for when, theres clearly a scene before J gets the wine for the last time that shows the goblet and Olenna in the background. She could have slipped it in then. I think it was right before Tyrion grabbed the goblet.

Maybe it was the pie, but that raises more questions than answers. Im skeptical of that theory.