You don't try to teach an old Ford new tricks. In Hollywood Homicide, heartthrob Josh Hartnett plays a rookie cop partnered with a veteran homicide detective played by Harrison Ford.

"Harrison loves to muck around with your mind," says Hartnett, whose films include Pearl Harbor, Halloween H2O, 40 Days and 40 Nights and Black Hawk Down.

"He has to push everyone and test everyone. He doesn't suffer fools lightly, so he pushes your buttons for a long time until you eventually stand up to him."

Hartnett recalls that one of the first scenes he shot was a crime scene investigation. He and Ford rehearsed it with director Ron Shelton.

"As soon as the cameras started rolling, I found out Harrison was going to walk in front of me whenever he could and was going to step on my lines.

"He was going to make me feel I had no business being there with him which, I found out later, was his way of testing me."

Hartnett actually went to director Shelton but got no sympathy.

"Ron said it was basically up to me to work around it. He said that Harrison is the big dog."

Hartnett's survival plan was to "make it all funny. I'd stay in the background and make it look as if my character idolized him and just always be on the periphery or near him doing something a little weird."

He must have done something right because Hartnett insists "by the end of the shoot we ended up getting along really well."

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Luke Wilson is learning it's difficult to stay cool when you're getting hot.

When Legally Blonde 2: Red, White and Blonde opens on July 2, Wilson will have three films in theatres.

In Alex and Emma, which opened Friday, Wilson plays a writer who must finish a novel in record time to pay off his gambling debts.

On Friday in Charlie's Angels: Full Throttle, he plays Cameron Diaz's boyfriend and in Legally Blonde 2, he plays Reese Witherspoon's fiance.

"It only looks like I'm taking over the summer," says Wilson. "Alex and Emma is a lead role, but my roles in Legally Blonde and Charlie's Angels are cameos."

He says he was the last person to think the first Charlie's Angels would gross $265 million US.

" I walked away thinking, 'Man, this is going to make Ishtar look like ET.' But then it turned out to be a really fun, cool movie to watch, which shows what little I know."