diff --git a/static/js/fest.js b/static/js/fest.js
new file mode 100644
index 0000000..0c223d8
--- /dev/null
+++ b/static/js/fest.js
@@ -0,0 +1,93 @@
+/**
+ * Fest Easter egg – type "fest" anywhere on the page to celebrate 🎉
+ * Triggered by: typing the letters f-e-s-t in sequence.
+ */
+(function () {
+  const TRIGGER = "fest";
+  const PARTICLE_COUNT = 120;
+  const DURATION_MS = 4000;
+  const COLORS = [
+    "#ff595e", "#ffca3a", "#6a4c93", "#1982c4",
+    "#8ac926", "#ff6d00", "#00b4d8", "#e040fb",
+  ];
+
+  let buffer = "";
+
+  document.addEventListener("keydown", (e) => {
+    if (e.ctrlKey || e.altKey || e.metaKey) return;
+    if (e.key.length !== 1) return;
+
+    buffer = (buffer + e.key.toLowerCase()).slice(-TRIGGER.length);
+    if (buffer === TRIGGER) {
+      launchFest();
+      buffer = "";
+    }
+  });
+
+  function launchFest() {
+    const container = document.createElement("div");
+    container.setAttribute("aria-hidden", "true");
+    Object.assign(container.style, {
+      position: "fixed",
+      top: "0",
+      left: "0",
+      width: "100%",
+      height: "100%",
+      pointerEvents: "none",
+      overflow: "hidden",
+      zIndex: "9999",
+    });
+    document.body.appendChild(container);
+
+    for (let i = 0; i < PARTICLE_COUNT; i++) {
+      spawnParticle(container);
+    }
+
+    setTimeout(() => container.remove(), DURATION_MS + 500);
+  }
+
+  function spawnParticle(container) {
+    const el = document.createElement("div");
+    const color = COLORS[Math.floor(Math.random() * COLORS.length)];
+    const size = 8 + Math.random() * 8;
+    const startX = Math.random() * 100;
+    const delay = Math.random() * 1200;
+    const spinDir = Math.random() < 0.5 ? 1 : -1;
+    const shape = Math.random() < 0.5 ? "50%" : "0%";
+
+    Object.assign(el.style, {
+      position: "absolute",
+      top: "-20px",
+      left: startX + "%",
+      width: size + "px",
+      height: size + "px",
+      backgroundColor: color,
+      borderRadius: shape,
+      opacity: "1",
+      transform: `rotate(${Math.random() * 360}deg)`,
+    });
+
+    el.animate(
+      [
+        {
+          top: "-20px",
+          transform: `rotate(0deg) translateX(0px)`,
+          opacity: 1,
+        },
+        {
+          top: "110%",
+          transform: `rotate(${spinDir * (360 + Math.random() * 720)}deg) translateX(${(Math.random() - 0.5) * 80}px)`,
+          opacity: 0.2,
+        },
+      ],
+      {
+        duration: DURATION_MS,
+        delay: delay,
+        easing: "ease-in",
+        fill: "forwards",
+      }
+    );
+
+    container.appendChild(el);
+  }
+})();
diff --git a/static/templates/base.html b/static/templates/base.html
index 66d20c5..6b2e440 100644
--- a/static/templates/base.html
+++ b/static/templates/base.html
@@ -81,5 +81,7 @@ <h1>ROV Mission Dashboard</h1>
   <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
   <!-- Custom JS -->
   <script src="/static/js/configuration.js"></script>
+  <!-- Fest Easter egg: type "fest" to celebrate 🎉 -->
+  <script src="/static/js/fest.js"></script>
 </body>
 </html>