Mary gives him a considering look, then evidentially decides a) his crazy isn't catching, b) he hasn't done anything too mental yet, and c) her British heritage demands she pretend there is no such thing as personal problems.

"Oh, a bunch of stuff. I figure if we don't hate each other by the end of the movie, we can make a night of it."

She holds out her hand to him, inviting him to take it. If he is a nutter, he really shouldn't be allowed to wander off, and if he's not, well, he's still cute.