Our favorite:
I seriously find myself acting like these are a treat because to my son, they are. So when he asks for a vitamin, I say, "Not until you finish eating your corn dog." Yeah it might seem like I have my priorities mixed up, but my son is lacking in the protein department and will use vitamins as an incentive to eat some types of protein (he still absolutely hates chicken... unless it's chicken nuggets). It makes me just want to hug that vitamin bottle. Okay, not really.
What about your kids? What kind of vitamins do they like?