The one thing LoL needs

Better laugh emotes.

Laugh shouldn't interrupt walking or abilities, instead it only plays the sound unless you stand still with no commands queued up.

It should work from invisibility, so you can hear Evelynn and Teemo laughs out of nowhere (but maybe not for bushes, which can be laughed in to check for wards depending on the enemy's response). It won't reveal, but it'll scare off enemies through making it clear your presence is there even if you have little health.

Let laughs work in alternate forms or self CC (channels, after death forms like eggnivia, dead Karthus, Zyra's true form, Sion and Kog self destructs. Maybe Zhonya's, GA, and Zilean ults)

Also let them be heard from a global/semi global range if they are currently using an ult or long range ability that can reach the people who can hear the laugh. (Xerath ult, Karthus ult, Caitlyn ult, Jinx ult but only while traveling and only within their range)

There. You added a psychological warfare element to the game, you'll no longer get people saying 'rekt noob' in all chat, and you'll make unfun champs amusing.