|This is an April Fools' Day version of Bug. Please don't take it seriously. You can find the original here.|
A bug is a small insect that crawls into Scratch via number inputs, for example, in the "move () steps" block. They can cause errors by eating the insides of said blocks and causing errors in the maths, especially if you're using trigonometry. There's a forums section dedicated to the extermination of exotic bugs residing in Scratch, while the ones hiding in users' projects are dealt with in Help with Scripts. Some bugs have become airborne and can affect users through cloud variables, shown by the ☁ icon. Bugs constantly find instruments so that they can play the Z chord. Due to the massive amount of bugs found in Scratch 3.0, we can assume that is their home planet. Scratch and bugs have been raging in an endless war since 1.0. Ever since then, both sides have evolved to the point that now only a few chosen elites can fight against them, the almighty Scratch Team.
"Bugs will never go away, once you get rid of one bug, (undefined) more show up." - some guy whose project was attacked by vicious bugs