The five movies are the primary component of the live-action movie continuity family. Their events should be taken as canon for all other pieces of fiction listed below, unless otherwise specified.
Agent Simmons went to the Witwicky residence when Sector Seven suspected that Sam Witwicky had made contact with an N.B.E. they were tracking. Taking Sam and Mikaela Banes into custody, he got too into the bad cop role, threatening Sam with life imprisonment, threatening Mikaela's father's parole, and revealing Mikaela's own criminal record. This strategy nearly succeeded...until a seriously pissed off Optimus Prime decided to pay Sam and Mikaela's bail—by jumping right in front of their SUV, lifting it off the ground, and tearing the roof off. Although Simmons tried to call for calm, the Autobots easily disarmed the agents. To Simmons's credit, he himself remained calm, while the guy to his left looked like he was going to wet himself.