Don't do crack before giving a talk

I'm sitting in a seminar right now which is ending up being far funnier than it should be.

The talk itself is somewhat interesting, talking about how best to search and match things in spherical coordinates.

The funny part is coming because the speaker is nervous and keeps digressing... "Wow, time is going fast, I don't think it's just me, it can't be this soda, wow, look at how much sugar this soda has" and then back to the talk.