Is it always laughter that removes negativity? Nah, so can a simple smile, or whistling a tune, or even a good meal. Whatever you think you need to get rid of negativity, do that or be that!
Even better to get positivity into play is to help make someone's life better. I've been doing that with a few people in my surroundings, just because it feels good. But there is a caveat here: as a giver you need to set the limits, because real takers won't! Fortunately I've ended up with people that aren't in that category.