Untitled

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>

<p id="frase" onmouseover="over()" onmouseout="out()">Tô tranquilo.</p>
<button onclick="normal()">Resetassaporra!</button>

<script>
function over() {
    document.getElementById("frase").innerHTML = "FODA-SE";
}
function out() {
    document.getElementById("frase").innerHTML = "CARALHO, VOLTA AQUI";
}
function normal() {
    document.getElementById("frase").innerHTML = "Tô tranquilo.";
}
</script>
</body>
</html>