If you are traveling with film, make sure to carry it on too. The scanners for checked luggage are much more powerful. Most film can withstand a few scans with the carry on scanners, but it never hurts to ask for hand inspection. Especially if it's 400iso or higher
Do you remember this from 2009 - "United Breaks Guitars." Great video and a super way for this guy to get back at an airline for crappy service and customer indifference.