Stephie: Why is my brain not working properly today Geoffy?
Geoff: Because sometimes your brain doesn't work properly. It goes a bit 'wheeeee'
Geoff: It does that to
Stephie: 'Booooh' and 'wheeee'?
Geoff: Yeah your brain has 'Boooo' chemicals and 'wheeee' chemicals fighting a battle over clusters of neurons. Today the 'booooo' chemicals are winning.
*recorded for posterity*