Put it at the very start of a return sequence, before the main action begins, then follow it with a funny laugh once everyone has reacted, and save the old-friend greeting for a later callback when the same person leaves and returns again.
About this sound
This eight-second clip is a warm, theatrical sung greeting, with a clear rock vocal welcoming friends back to a show that never ends. It feels grand, cheerful and a little dramatic, like a curtain rising on a familiar act. It comes from Emerson, Lake & Palmer's 'Karn Evil 9,' where the line opens the song's celebrated sequence.