I saw a tiny tot wearing a tee-shirt that said 'Teething - it's the pits!' which I thought was magic.
I also saw a seriously large guy at a festival once, he was about six feet four, and as far across, covered in tats, with a bald head, goatee, earings, and a really seriously intimidating frown on his face.
His tee slogan - 'Warning, does not play well with others' rather summed him up!