How Do You Know (2010) is a romantic comedy starring Reese Witherspoon, Owen Wilson, Paul Rudd and Jack Nicholson.
This film suffers from not being very funny. The characters are not as funny or quirky as they need to be to make the audience care about them.
Witherspoon is a little bit bland and Rudd seems to be on automatic pilot mode. Wilson tries to be quirky but his character is just annoying and even the great Jack Nicholson fails to get any laughs.
The movie seems to struggle to engage its audience and writer/director James L Brooks is guilty of letting the movie become unfocused. Its not awful but its a long way from Brooks masterpiece As Good As It Gets.