Matthew McConaughey says his 2003 romantic comedy “How to Lose a Guy in 10 Days” remains his top earner in residual payments, even two decades after its release. In a new interview, the actor described the film as “the gift that keeps on giving” and said it still brings in more “mailbox money” than any of his other movies. McConaughey has starred in several rom-coms over his career, but he singled out this one as the most profitable in terms of long-term payments. Residuals, often called “mailbox money,” are payments actors receive when a film is replayed on TV, streaming, or other platforms.