Hollywood star Shia LaBeouf really regrets his 2007 arrest for trespassing in a Chicago drugstore, insisting the incident occurred in a moment of "utter insanity." The Transformers star, 21, was charged with a public misdemeanor in November, after refusing to leave a Walgreen's while drunk. The charges were later dropped. But LaBeouf admits the bizarre event was an isolated incident, which he is putting behind him as a life lesson. He tells the British magazine Empire, "That was complete and utter insanity. I was an [bleep], and it was a mistake I'm still completely embarrassed about. "I was in the middle of a strange mind state, having just come off a three-month window of focus. I can't diminish what happened at all. But I can say this: I'm not the first 21-year-old to be arrested for a misdemeanor. There are lessons in life I need to learn, and I'm learning all of them in front of the public."