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Re:A Conversation with Paul Graham [video] by ryeguy_24 on Saturday September 01, 2018 @07:11AM (#17891315)
I agree, but it's also his trademark. Kinda like Michael Jackson's "Hee-Hee". :)
Re:A Conversation with Paul Graham [video] by duncanawoods on Saturday September 01, 2018 @08:20AM (#17891494)
Its a viral trademark too - you used to be able to spot YC founders and staff because they would uhm in just the same way. JL has an identical uhm to PG.

It seems kind of functional - it usually follows something cheeky / provocative - its basically a pause for laughter.