This video deals with how children who stick to a vegan diet deal with pressures or questions in social settings like school or birthday parties.
I think this approach is great because he is not trying to convert anyone or tell his friends they are wrong in the way that they eat. This cool kid simply explains that this is his choice and his lifestyle.
Honestly, I think a lot of adult vegans can learn from this. (Hooray for non-preachy vegans, right @agrainofsalt ?)