What goes into a good joke? Professional comedians say the secret ingredient is…surprise. If you can catch your audience off guard, even with a silly joke, you’ll get a laugh.

And whether or not we realize it, we’ve all experienced that for ourselves. Have you ever found yourself laughing at a joke and wondered, “Why am I laughing at this? That’s the dumbest thing I’ve ever heard.” Or maybe it’s not dumb, it’s just so absurd — you can’t explain why it’s so funny. It comes down to that secret ingredient, surprise. And some good comedic timing, of course.

That’s why we laugh at puns, too. You probably know someone obsessed with terrible puns. They’re so dumb, they make you groan — and sometimes they even fill you with inexplicable rage. But we still laugh at them for reasons we can’t explain.

And then, of course, there’s the dad joke — a joke that’s so corny, it could only be told by your, well, dad. Do they develop a sixth sense for ridiculous jokes the minute they become fathers? We’ll never know.

Here are 75 jokes that are so bad, you can’t help but laugh at them.