I spoke at the Ruby Hoedown last weekend and had a blast. I didn't get to attend much of the conference due to my travel. However, that talk was the last time my shiny new MacBook Pro would boot!
It had been locking up with an increasing frequency... it locked up when I took it to the front of the room to start speaking. What timing! It took nearly 10 minutes to reboot.... during that time, I got to entertain the audience with just my wit. (Pity the audience.)
Fortunately I had also brought along some candy. I like to throw candy into an audience at random from time to time. It keeps everyone alert and laughing. And on this occasion, it was perfect.