Regis Philbin really was the greatest late-night guest.

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Over the weekend, in tribute to the iconic TV personality who passed away Friday, the “Conan” team shared a clip from an old episode of “Late Night with Conan O’Brien”.

During the interview from 1999, Philbin talks with the host about their shared Irish heritage.

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Then, near the end of the interview, Philbin goes all out on his Irish roots, getting O’Brien’s sidekick Andy Richter to wear a baby bonnet in his lap while he serenades him with the Irish lullaby, “Too-Ra-Loo-Ra-Loo-Ral”.