Question

dont trust that mechanic to change the oil for your car because hes driven over a nail before.
hasty generalization
faulty analogy
post hoc
either/or
ad hominem
bandwagon
slippery slope
straw man
circular reasoning
dubious authority
you cant trick me! this is a good argument, not a fallacy!

Explanation:

Hasty Generalization occurs when a conclusion is drawn from insufficient evidence. Here, the fact that the mechanic drove over a nail (a single incident) is used to generalize that he can't be trusted to change oil. This is a leap without proper, comprehensive evidence about his oil - changing skills.
Faulty Analogy would involve comparing two things that aren't truly comparable in a relevant way. But here, it's not an analogy. Post Hoc is about assuming causation because one event followed another. There's no such causation claim here. Either/Or is presenting only two extreme options. Ad Hominem is attacking the person instead of the argument (but here, it's about his past action, not a general attack on his character in an argumentative sense). Bandwagon is about following the crowd. Slippery Slope is about a chain of events. Straw Man is misrepresenting an opponent's argument. Circular Reasoning is when the premise and conclusion are the same. Dubious Authority is relying on an unqualified source. This is clearly a hasty generalization.

Answer:

Hasty Generalization