javascript:(()=>{
  let i=0,s=0,f=0;

  function spawnCat(){
    const cat=document.createElement("img");
    cat.src="https://m.media-amazon.com/images/I/61bNReC5OVL._AC_UF894,1000_QL80_.jpg";
    cat.style.position="fixed";
    cat.style.left=Math.random()*window.innerWidth+"px";
    cat.style.top=Math.random()*window.innerHeight+"px";
    cat.style.width="80px";
    cat.style.zIndex="999999";
    cat.style.pointerEvents="none";
    cat.style.transition="transform 0.2s linear, opacity 0.2s linear";
    document.body.appendChild(cat);
    setTimeout(()=>{
      cat.style.opacity="0";
      cat.style.transform="translateY(-100px) rotate("+(Math.random()*360)+"deg)";
    },3000);
    setTimeout(()=>cat.remove(),4000);
  }

  let t=setInterval(()=>{
    i+=20;
    s+=0.1;
    f+=Math.random()*2;

    document.body.style.filter=`hue-rotate(${i}deg) invert(${Math.floor(f)%2})`;
    document.body.style.transform=`rotate(${i}deg) scale(${1+Math.sin(s)*1.2}) skew(${Math.sin(s)*30}deg,${Math.cos(s)*30}deg)`;
    document.body.style.backgroundColor=`hsl(${i%360},100%,${50+Math.sin(s)*20}%)`;
    document.body.style.transition="transform 0.05s, filter 0.05s, background-color 0.05s";

    // spawn multiple cats each interval
    spawnCat();
    if(Math.random()>0.7) spawnCat();
    if(Math.random()>0.9) spawnCat();
  },100);

  setTimeout(()=>{
    clearInterval(t);
    document.body.style.transform="";
    document.body.style.filter="";
    document.body.style.backgroundColor="";
  },10000);
})();