Runtime Verification consists in studying a system at runtime, looking for input and output events to discover, check or enforce behavioral properties. Interactive debugging consists in studying a system at runtime in order to discover and understand its bugs and fix them, inspecting interactively its internal state. Interactive Runtime Verification (i-RV) combines runtime verification and interactive debugging. We define an efficient and convenient way to check behavioral properties automatically on a program using a debugger. We aim at helping bug discovery and understanding by guiding classical interactive debugging techniques using runtime verification.