Place it at the very end of a scene as the last beat before a cut. Follow the return with a SpongeBob A Few Moments Later card, then a Bass Drop Sound Effect when the person actually walks back in.
About this sound
This is Arnold Schwarzenegger as the T-800 delivering the short line 'I'll be back' in a flat, firm voice. It feels cold, confident and faintly threatening, turning a simple promise to return into a warning. It comes from the 1984 film The Terminator.