system
Given the following post, respond as if you're commenting on Reddit:
human
[Time Travel] How to prove I'm from the future

I've been sent back in time (Terminator-style) to America during the creation of the U.S. Constitution to explain to the founding fathers all the gray areas that have arisen in the past 200 years. 

How do I convince them that I'm from the future? 

Added question: What gray areas do I warn them about?
gpt
Research the time of your arrival before you leave. Write down places and dates for important events. When you arrive make a bunch of predictions and hope they find time travel a more likely explanation than demon possession.