Argument fallacies

1. Argumentum ad numerum, fallacy is the attempt to prove something by showing how many people think that it's true. 

2. Argumentum ad populum, the fallacy of trying to prove something by showing that the public agrees with you.   

3. Cum hoc ergo propter hoc, fallacy of mistaking correlation for causation -- i.e., thinking that because two things occur simultaneously, one must be a cause of the other. 

4. Post hoc ergo propter hoc, the fallacy of assuming that A caused B simply because A happened prior to B. 

5. Slippery slope, fallacy is an argument that says adopting one policy or taking one action will lead to a series of other policies or actions also being taken, without showing a causal connection between the advocated policy and the consequent policies.