It's that time of year again: Halloween. So time to think up some really great pranks. Today Cool Websites and Apps has five great tricks you can pull using only your phone.

We showed you how to prank the family computer; today we're going mobile, with prank apps that do everything from sending your friends random facts to hitting the "Like" button on embarrassingly old pictures. Let's get started, so you can annoy your friends or make them uncomfortable. It's the little things in life, isn't it?

CatFacts (Android, Free): Annoy Your Friends with Constant Cat Facts

Wouldn't it be great if someone sent you facts about cats, every half hour, without asking for permission? Of course it wouldn't be! Which is why you should do this to your friends.

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CatFacts is a free Android app that lets you send facts about cats to your friends on a set schedule. You can send an unlimited amount from your own number, or 10 from an anonymous number that your friend won't recognize. You can pay to send more anonymous facts, or to purchase facts about other animals, like dogs or sloths.

The app was inspired by a hilarious Reddit post, where someone annoyed their cousin by sending them cat facts – so this is a proven prank. Sure, you could just head to sites with strange and unusual facts and do this manually, but why bother when Cat Facts can do it for you? Give it a shot, and let us know how your former friends react.

Like Creeper (Web), Randomly Like a Really Old Photo on Instagram

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Seeing a "Like" notification show up on a really old Instagram photo is uncomfortable because of what it implies: someone spending hours and hours scrolling through your feed, looking at your face, until eventually arriving at a photo from half a decade ago. Even if you've been doing just that, never hit the "Like" button. You don't want to be that guy.

Unless, of course, you actually want to creep someone out.

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If that's you, Like Creeper can save you the time of creepily going through old photos and just like a really old photo at random. Your friend will feel uncomfortable in no time.

PrankDial (Android, Free): Prank Calls Without the Creativity

Prank phone calls are fun, but do them too often and people will start recognizing your voice. PrankDial gets around this with a number of pre-recorded prank conversations – and an app you can use to sic 'em on your friends.

A recent update seems to be causing some users problems, mostly involving tokens used by people who make more than two phone calls a day, but the team seems to be working on it in any case.

Fake CheckIn (iOS, $1): Check in to Places You've Never Been

Checking into exotic locations on Facebook is a quick way to get likes, and a lot of comments about how jealous your friends are. If you want to trigger this without, you know, actually doing things, Fake CheckIn can help.

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Just pick a place you'd like to pretend to be, then check in on Facebook or Google Places.

WhatsFakeApp (iOS): Make Fake WhatsApp Conversations

Screenshots of conversations from services like WhatsApp can be hilarious, but they're also easy to fake. WhatsFakeApp, for example, lets you construct a fake chat out of thin ear.

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If you want to embarrass someone by putting words in their mouth, or create "evidence" of a conversation you had with someone, this is the tool to get. It's got a surprising level of detail to offer, letting you configure all sorts of things, so see what you can create – and consider sharing your best work in the comments below.

What Are Your Favorite Phone Pranks?

It's a great time of year to be pranking, and there are more things we could point out: the popular prank call websites, for example, or all of the pranks you can find on YouTube. There are sites with physical prank ideas, and other sites with practical joke ideas.

Like I said: we could go on. But we'd prefer if you did.

What are your favorite phone pranks? Do you have any apps or sites you like to use to find them? Let's chat in the comments below, okay?