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If I didn't already know what a hash table was, I think I would hate this intro, because it's promising something (a perfect hash) that we're not actually going to get. So already I'm thinking about how we're going to get something like that and how impossible it seems.

Whether I will be able to continue following the rest of the presentation or not is up in the air, because every subsequent sentence is going to be tested against this bar and I'm going to get more and more confused about how this is getting us where we were supposed to be going.

The fact that the original paragraph is memorable is actually going to work against you here, because it makes it less likely that I'll just forget about it and go along with the bait and switch.