In a rather extreme case, which thankfully we don't hear of two often, a young mum was asked to leave a Caffe Nero as her little boy was being 'too noisy'. 

Aaron has recently been diagnosed with Attention Deficit Hyperactivity Disorder and had become loud and distressed. The parents  had been trying distraction techniques to calm him down before they were asked to leave. 

Nero have since offered an apology. 

http://www.thisissomerset.co.uk/Caffe-Nero-apology-young-mum-kicked-noisy-boy/story-18287345-detail/story.html#axzz2T4VpPM4r