Barney Stinson is the scheming, suit-obsessed character played by Neil Patrick Harris in the sitcom How I Met Your Mother, which ran from 2005 to 2014. His evil laugh became a recurring part of his persona, used whenever one of his elaborate plans, bets or playbook moves was paying off. Clips of the laugh later circulated as a reaction sound on video and meme platforms, where creators reuse it to signal mischief, plotting or a smug victory. It endures because the character is instantly recognisable and the laugh needs no context to land as a joke.