They're the defintion of practical magic. Welcome to MsMojo today we’re counting down instances where the “Harry Potter” movies utilized practical effects rather than solely relying on CGI.

No computers needed here! For this list, we’ll be looking at the best, most believable or iconic examples of practical effects found within horror movies.

CGI just can’t make your skin crawl like these effects can. Join http://www.WatchMojo.com as we count down the Top 10 Scariest Practical Effects in Movies.

Practicality is not always better. Join http://www.WatchMojo.com as we count down our picks for Top 10 Worst Practical Special Effects in Movies.

What you see is never what you get. Join http://www.WatchMojo.com as we count down our picks for the top 10 practical special effects in movies. For this list, we've focused on on-camera magic in the form of prosthetics, animatronics, puppets or anything else these geniuses can think of.

These practical effects from the "Beetlejuice" comedy-horror flicks will blow you away! Welcome to WatchMojo, and today we’re looking at the most eye-popping practical effects in both “Beetlejuice” movies.

Before CGI, we had to use a little imagination! Welcome to WatchMojo, and today we’re counting down our picks for incredible practical effects from pre-2000s films that are still impressive today.

You don't need computers to create awful special effects! For this list, we’ll be looking at visual effects that were meant to be treated seriously, but look so ridiculous that we can’t help but giggle or groan.

Why accept computer-generated imagery when you can have the real thing? For this list, we’re looking at scenes from films that feature heavy practical effects work, with special attention going to the ones that are the most unbelievable.

Get ready for a cringe-fest of digital disasters! We're diving into the most jaw-droppingly terrible CGI effects that made superhero movies look like they were rendered on a potato. From floating heads to rubbery limbs, these visual effects will make you laugh, cry, and question Hollywood's budget allocation!

Prepare for the most spine-chilling zombie transformations ever captured on film! We're diving deep into the most horrifying, gruesome, and shocking metamorphoses that will make your skin crawl. From classic horror to modern blockbusters, these undead transformations redefine terror and push the boundaries of practical effects.

Who needs CGI? Welcome to WatchMojo, and today we’re counting down our picks for the most effective instances where an actor was made-up to embody horror characters.

These terrible CGI movie effects will leave you shaking your head in disbelief. For this list, we’ll be looking at the most embarrassing and unconvincing special effects found in comic book movies.

Not even big budgets can save these movies from rotten special effects. For this list, we're looking at the compositing shots in films released after the 1980s that looked embarrassing instead of impressive. We're basing our picks on a mix of poor blending, cartoony looks and the comedy or cringe that arises as a result of these poor effects. Though the films we mention are not necessarily terrible, we're excluding the poorly financed world of indie flicks and b-movies no matter how egregious their contributions may be. Our countdown includes films such as "Speed Racer" (2008), "The Last Airbender" (2010) & "X-Men Origins: Wolverine" (2009). Which movie do YOU think has the worst blue/green-screen effects? Let us know in the comments!

Hey, at least these films give us something pretty to look at while turning our brains into mush. For this list, we’re looking at films that featured great CGI effects, while missing the mark as overall movies. Think “Sucker Punch” (2011), “The Golden Compass” (2007), “Jupiter Ascending” (2015), and “Total Recall” (2012). What’s a mediocre movie with CGI effects that impressed YOU? Let us know in the comments!