It is widely thought that bad originated from [[BAD™ reactor|BAD™ reactors]], which are suspected to have been yielded from retroactive BAD™ reactor influence, due to them being bad.
Some examples of bad things are [[gollark]] and [[GTech]], as well as [[BAD™]] reactors. The continued deployment of [[IPv4]], as well as [[gollark's opinions]], are also widely held to be examples of bad.