Michael Bay looks to be having a blast on the set of Transformers: Age of Extinction, and we mean that quite literally. Michael Bay tweeted out the behind the scenes photos, which shows lots of things exploding. Of course, what would you expect? It is a Transformers movie after all. Transformers: Age of Extinction features Kelsey Grammer, Mark Wahlberg, Jack Reynor, Stanley Tucci, Nicola Peltz, Sophia Myles, Li Bingbing, T.J. Miller, Peter Cullen, Geng Han and Titus Welliver. Transformers: Age Of Extinction will open on June 27, 2014.