A key problem during source code reuse is that, to reuse even a small section of code from a program, a programmer must include a huge amount of dependency source code from elsewhere in the same program. These dependencies are notoriously large and complex, and many can only be known at runtime. In this paper, we propose execution record/replay as a solution to this problem. We describe a novel reuse technique that allows programmers to reuse functions from a C or C++ program, by recording the execution of the program and selectively modifying how its functions are replayed. We have implemented our technique and evaluated it in a preliminary study in which two programmers used our tool to complete four tasks over four hours.