I went to one of the Spiderman films and there was a child behind me that was obviously too young and clearly bored. Throughout the ENTIRE film he fidgeted, kicked the back of my seat, rustled/shook/crumpled/slurped/chomped food and drink, and repeatedly asked his ineffectual, inconsiderate, over-indulgent parent 'Where's Spidey? ... Where's Spidey? ... Where's Spidey now? ...'
Obviously I don't blame the child, but it was a terrible parenting decision. Please don't, unless you can pick a showing that you know will be full of kids and empty of adults wanting to watch the film in peace.