My lack of excitement was interpreted as a lack of passion. And I was told startups look for passion. So sorry. I found it both annoying and silly. Silly, because the founder hadn't sounded any more excited than me and passion is such a vague term for him to look for.
The irony is i can and have gotten extremely excited (mostly when i am not recalling anything similar) in the past, but found that it is a disappointment almost always. So nowadays, i try to recall similar things and try to see the differences.