kisses, popcorn buckets, and laughing at "no"

The affection was being handed out like candy this weekend.  And this time it was from boys to parents, boys to grandparents, boys to each other.  Suddenly they want to express their love through touching open mouth to cheek.  It's endearing, funny, adorable.  

Jerry and I got to go on a date yesterday, including a movie with popcorn in a bucket.  We brought said bucket home with us, because it was so huge that we didn't eat all of the popcorn.  W decided it is the best toy ever.  It will probably occupy that status for at least a week.  That is, if G doesn't do an intentional nose-dive onto it, smashing it flat.  These scenarios are equally plausible.  So W likes to wear this bucket on his head and then put it on our heads to see our reactions, "I can't see!!!".  This cracks him up.

Speaking of laughter - apparently we're so unfortunate as to have two toddlers who aren't phased by a stern, serious-sounding "NO".  In fact, rather than be reduced to tears, they laugh.  Yes, they somehow think it's a game.  So we're going to have to figure out whether time-outs can be effective this young (not-quite-15 months).  How do we teach them not to do something and that we're the parents-in-charge, if they laugh at "no"?  Any suggestions are welcomed!