The best presentations end like this.

I have felt this way so many times

Once in History @ur_mom and I did a presentation about the horrible conditions of the Democratic Republic of the Congo. It was pretty heavy so to lighten the mood, we put a picture of Britney on the last slide and laughed our asses off as our class looked at us in horror. We got five points off for our 'little stunt'
https://s-media-cache-ak0.pinimg.com/564x/58/68/83/58688366b8d4e2a2fa94459ee4f71558.jpg