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SPEAKER 1: What is something
that makes you feel old?

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SPEAKER 2: Oh, so a lot of
pop culture things, especially

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in a teaching context.

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Like, for years I was in the habit of
using Seinfeld references, which is

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a very popular American funny TV show.

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But drifting, I guess,
out of date, recollection.

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I have been, for the
past few years, using

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The Office, because The
Office, especially online,

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has continued to be
popular among kids today.

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We've recently switched to
using Nintendo characters, which

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have kind of been around
now for decades and keep

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kind of getting refreshed in some way.

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So that's been helpful.

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But it's whenever I make a
comment like that about some show

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that some students don't
get, that I do feel old.

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And in fact, this sort of canonical
demonstration that we do in CS50

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is when in a discussion
of binary search, which

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it means searching efficiently
by dividing a problem in half

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again and again.

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And for this we've used,
for 17 years, a phone book.

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And I think we hit the point a year
ago where someone online asked,

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What is that he's holding?

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And--

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SPEAKER 1: What is a phone phone?

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SPEAKER 2: --that make me feel old.