Manoel Gomes is a Brazilian singer who became an internet sensation with Caneta Azul, a simple song about a blue pen that spread widely through WhatsApp, YouTube and social media in Brazil. His expressive voice and catchy delivery made short clips of him popular far beyond the original song, and the repeated aí became a recognisable reaction sound in Brazilian meme culture. Creators still reuse it because it is instantly understood, even by viewers who do not know the song, as a burst of excitement.