Slappy

Slappy is a strange, noticeably insane citizen of The Hub, who spends his time wandering aimlessly while uttering bizarre and nonsensical catchphrases near Harold's home in Old Town.

You are directed to Slappy after talking to Harold.

He can tell the Vault Dweller where the Deathclaw's lair was located, after talking to Harold of course. It turns out that the reason why Slappy has gone insane is that he was hanging around the deathclaw's lair. Slappy may, or may not have been from a caravan.