Regardless, literally everything I've ever seen (and a lot on tfwiki) attributes Megatron's slide into violence to Whirl beating him up while in custody. Maybe not like flicking a switch but Megatron's line "You made me. You taught me words were weightless without force" kinda spells it out.
So hey I bought Triggerhappy from Walmart a few days ago and just notice the receipt said TRIGGERHAPPY on it. Not the assortment name or whatever. Are they using this info to better track character sales or something?
Excited for Grimlock (shipping) - I will say that early photos had me concerned about the face. Looked like he had lips. Not cool... but new pics make it look like a really cool mouthpice so all is good.