Async Missed A Callback

Level 1: The Friend Who Answers Later

Imagine asking a friend to bring you a snack, but they are busy, so you keep playing while you wait. Later, they come back and tell you they are done. That "come back later and tell me" idea is like a callback. The joke is that the phone is talking about calling someone back, but programmers also use "callback" for work that finishes later.

Level 2: Work That Finishes Later

In normal code, one line runs after another. If a line takes a long time, the program may have to wait. Asynchronous programming lets a program start slow work, such as a network request, and continue doing other things while waiting for the result.

A callback is a function passed into another function. The program runs it later when something happens. For example, a button click handler is a callback. A network request finishing can also trigger a callback.

async/await is a newer style that makes asynchronous code easier to read. Instead of nesting many callback functions, code can look more like a sequence:

const user = await getUser(id);
const orders = await getOrders(user.id);
renderOrders(orders);

The meme is funny because "call back" is both a phone action and a programming term. The phone says async missed a call, so it offers to "Call Back," which sounds exactly like old-school asynchronous control flow.

Level 3: Callback Missed You

The image looks like an iOS phone notification. The caller name is:

async

The status says:

Missed call

and the main action offered is:

Call Back

That is the whole pun, and it is annoyingly efficient. Asynchronous programming is about starting work that will finish later, without blocking the current flow. A callback is a function you provide so the system can "call back" when that later work completes. The phone UI accidentally becomes a programming diagram: async missed a call, and now the only responsible thing to do is callback.

The senior-developer layer is that callbacks are both foundational and historically responsible for a lot of control-flow bruising. Event handlers, timers, network responses, filesystem reads, and UI interactions all used callbacks long before async/await made asynchronous code look more linear. The problem is that real applications rarely have one neat callback. They have callbacks that schedule callbacks, callbacks that handle errors differently, callbacks that fire after state has changed, and callbacks that still run after the user navigated away. That is where callback hell earned its cheerful little name.

getUser(id, function (user) {
  getOrders(user.id, function (orders) {
    renderOrders(orders, function () {
      trackView("orders");
    });
  });
});

Modern async/await did not remove asynchrony. It changed the syntax and made many flows easier to read. Underneath, promises, tasks, event loops, queues, and continuations are still coordinating work that completes later. The notification's "Missed call" is funny because asynchronous code is exactly where timing matters: if you call too early, data is not ready; if you call too late, the UI state may be gone; if you forget to call at all, someone is staring at a spinner and filing a ticket titled "sometimes broken."

The close button in the top right is also spiritually accurate. Every developer has wanted to dismiss an asynchronous flow that became too clever. Unfortunately, the background task is still running, the cancellation token was optional, and the callback is about to update a component that no longer exists. Please enjoy your warning in the console.