Four steps of modern skepticism

[Laird]

1. Question: How could this be wrong?
   
2. Hypothesise: This - some given thing/scenario/reason, no matter how unlikely, implausible, and unsupported by evidence - is how it could be wrong.
   
3. Reason: That, then, is why it is wrong.
   
4. Conclude: Therefore, it is wrong.
   

Be careful to apply these absolutely logically valid steps only to ideas in whose falsity you are invested, and not to your own ideas - to which they could equally be applied. Skepticism, after all, is about proving shonky thinkers wrong, and you are a bastion of evidence-based reason.