Grant doesn’t reveal a lot of the details of what happened on set on the day in question, other than to say he lost his temper. From the sound of it, the object of his ire was somehow interfering with a shot he was in, causing him to shout. Grant summed up the situation thus: 

“I lost my temper with a woman in my eyeline on day one. I assumed she was some executive from the studio who should have known better. […] Then it turns out that she’s an extremely nice local woman who was the chaperone of the young girl. Terrible. A lot of groveling … I did a Christian Bale.”

Grant is referring to a well-publicized incident from the set of “Terminator Salvation” in 2009, wherein actor Christian Bale, when finding the film’s cinematographer Shane Hurlbut had blocked the camera and messed up a particular shot, blew his stack. Bale ranted at Hurlbut for several minutes, spewing forth many obscenities. Audio of his rant eventually leaked, and Bale was openly apologetic. Bale later admitted he regrets “Terminator Salvation,” only signing on out of spite after turning it down three times.

Grant has also had to apologize in the past. In a 2015 interview with Vanity Fair, the actor admitted that he behaved very badly on the set of “The Daily Show.” Host Jon Stewart even went so far as to call Grant the worst guest his show had ever hosted. Grant said that his tantrums were something he does on the regular, admitting, “I did have a tantrum backstage. About once a year, I have a really mega-tantrum, and sadly he witnessed one.” 

Grant has apologized for his untoward behavior. One hopes the tantrums can now cease.