Winning 1kb intro released at Assembly 2015 - https://news.ycombinator.com/item?id=10068655

assembly-2015-1k-winner-prettified.js

function u() {
    requestAnimationFrame(u);

    g = p ? 
        audio.currentTime * 60 : (
            audio = "RIFFdataWAVEfmt " + atob("EAAAAAEAAQAAeAAAAHgAAAEACAA") + "data",

            b.style.background = "radial-gradient(circle,#345,#000)",
            b.style.position = "fixed",
            b.style.height = b.style.width = "100%",
            b.height = 720,
            h = b.style.left = b.style.top = A = f = C = 0,
            
            6177
        );


    for (; g > f; h *= f % 1 ? 1 : 0.995) {

        s = Math.pow(Math.min(f / 5457, 1), 87) + Math.pow(1 - Math.min(f / 5457, 1), 8);

        if (f == [b.width = 1280, 1599, 2175, 2469, 2777, 3183, 3369, 3995, 4199, 4470, 4777, 5120][C]) {
            C++;
            h = 640;
        }

        f += p ? 
            (ctx.translate(640, 360 + h / 45 * Math.random()),
            ctx.rotate(A / 5457 - h / 5457),
            ctx.scale(1 + s * 8, 1 + s * 8),
            1) 
        : 
            (audio += T((1 + s * 8) * Math.random() + (1 - s) * (h / 45 * (f * (2 + C / 3 % 1) & 1) + (C > 3) * 8 * (f * (2 + (f / 8 & 3)) % 1)) | 1), 1 / 512);

        i = p.length;

        
        for (; i; ) {
            y = p[i -= 7];
            x = p[i ^= 1];
            r = p[i + 4];
            l = p[i + 6];
            s = 2 * Math.random() + 1;
            t = s * 4;
            a = 122;
            if (640 > r) {
                if (!(640 > Math.abs(p[i ^= 1] += p[i + 2]))) {
                    p[i + 2] *= -1;
                }
                if (!(640 > Math.abs(p[i ^= 1] += p[i + 2]))) {
                    p[i + 2] *= -1;
                }
                t = Math.random() > p[i + 7] || p[i + 7] == "22312131212313"[C] & h == 640;
                w = x - A;
                if (!p[i + 2]) {
                    if (r * r / 3 > w * w) {
                        t = s * (r - Math.abs(w)) / 45 + 2;
                        a = 2 * Math.random() + 5;
                        p.push(A, 0, s * Math.sin(a += 599), s * Math.sin(a - 11), s * t, C + s, 640, 0.995);
                        s = 2 * Math.random() + 1;
                        a = 2 * Math.random() + 5;
                        p.push(A, 0, s * Math.sin(a += 599), s * Math.sin(a - 11), s * t, C + s, 640, 0.995);
                        s = 2 * Math.random() + 1;
                        a = 2 * Math.random() + 2;
                        p.push(A, 0, s * Math.sin(a += 599), s * Math.sin(a - 11), s * t, C + s, 640, 0.995);
                    }
                }
                a = p[i + 2] * y / 45;
                l = p[i + 6] = t ? 640 : 0.9 * l;
                t = r;
            } else {
                A = p[i]++;
            }
            if (!(g > f)) {
                s = r;
                ctx.beginPath();
                ctx.lineTo(x + s * Math.sin(a += 599), y - s * Math.sin(a - 11));
                s = t;
                ctx.lineTo(x + s * Math.sin(a += 599), y - s * Math.sin(a - 11));
                ctx.lineTo(x + s * Math.sin(a += 599), y - s * Math.sin(a - 11));
                ctx.shadowBlur = r;
                s = l;
                x = s * 2;
                a = p[i + 5];
                ctx.shadowColor = ctx.fillStyle = "rgb(" + [x + s * Math.sin(a += 599) | 1, x + s * Math.sin(a += 599) | 1, x + s * Math.sin(a += 599) | 1] + ")";
                ctx.fill();
            }
        }
    }
    if (p) {
        ctx.fillText("BLCK4777", 90, 99);
    } else {
        (audio = new Audio("data:Audio/WAV;base64," + btoa(audio))).play(p = [f = C = 0, 0, 0, 0, 180, 2, 0, 1, -360, 0, 0, 0, 99, 1, 0, 2, 360, 0, 0, 0, 99, 1, 0, 3, -2880, 0, 0, 0, 1280, 0, 1280, 0]);
    }
};