There were some science fiction stories (I forgot their names and authors) in which time travelers actually encounter a lot of practical difficulties in past societies, because the people they encounter don't believe them or don't readily see the benefits of their suggestions. So maybe you need to add "a stone-age agrarian society that's eager to take advantage of my knowledge", since that part can't necessarily be taken for granted. :-)
This. I just saw a documentary about famous inventions yesterday. They talked about how when Alexander Graham Bell conceptualized the telephone, most investors said "Why should we ever need this? We can already transmit speech with telegraphs."
I guess the same effect amplifies the more absurd or outlandish the proposed technology appears.
