Even though as the parent it may be uncomfortable to witness a tantrum, I think it's really important to focus on supporting our children through tantrums rather than trying to stop them. I think that when children have tantrums, they have lost control due to very powerful feelings. I think it's important to validate those feelings and to honor them by staying near the child as he works through the tantrum but otherwise doing nothing. Some parents find it helpful to validate the child's feelings, but now that I have a verbal toddler, she tells me that she prefers me to be silent. Sometimes I intuit that it would be good to pick her up. If she resists, I let her stay on the floor, but sometimes that will help bring the tantrum to a close. But I think it is essential to be okay with the tantrum continuing. I find that I'm the most uncomfortable with a tantrum in public, so I find it the easiest to be comfortable allowing the tantrum to continue as long as she needs by moving us to as private of a location as I can find (maybe the bathroom or the corner of the store, etc...).