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Use a fake check-in app to make your friend jealous. Tag your friends in random photos. Add your friends to random Facebook groups. Leave your friends nonsensical messages. Hack your friend's account to post goofy content.
Think about places your friend has on their bucket list. Maybe your friend has always wanted to go to Disney World or visit a particular restaurant in your town. Download a fake check-in app for a social media site like Facebook and "check in" to your friend's favorite destinations. If your friend sees this, they may get jealous. You can even go as far as to tag your friend in posts to make sure they see. For example, tag your friend saying something like, "Thinking of you! Know how much you've always wanted to go here." People often get annoyed by unnecessary notifications. If your friend has a social media site like Facebook or Twitter, tag them in random posts or statuses. For example, tag your friend as a picture of a pan at your apartment. If you go to the zoo, tag your friend as random pictures of animals. They'll be bombarded with random notifications from nonsensical pictures. However, make sure not to tag your friend in a way that could be read as offensive. A friend who's sensitive about their weight, for example, may take offense if you tag them as a cow in a picture. Instead, tag them as something completely random, like a shoe. If you can get ahold of your friend's computer for a moment, get on their Facebook. Join a bunch of random groups and like a bunch of random pages. This way, your friend's news feed will suddenly be full of random content.  You can pick completely random pages. For example, add your friend to a page called "I Love Goats." You can also add your friend to pages expressing opinions or tastes your friend disagrees with. For example, maybe your friend hates Ayn Rand. Have them join an Ayn Rand fan page on Facebook. Post messages on your friend's Facebook wall or send them tweets that are completely random. This will leave your friend confused and guessing as to what you mean. You can do things like leave links to random pages, like the IMDb page of an obscure film from a few years ago, or simply leave messages that don't make sense. For example, leave a message that looks out of context. Send them a Tweet saying something like, "Wow, that was epic. Never heard you laugh that hard!" Your friend will be left guessing what you're referencing. If you can get ahold of your friend's phone or computer, see if they're logged on to Twitter or Facebook. Post ridiculous tweets or statuses that would make your friend blush. For example, if your friend is a hardcore Democrat, post something like, "Vote Republican this November!"  Make sure the content is appropriate, however. Avoid posting any NSFW (not safe for work) content or foul language.