Went to Canada in between my last US visit, so I already encountered Homeland Security officers in Toronto. Since I only declared an 8-day stay when I entered Canada, my 6-month I-94 card from when I first entered the US wasn't detached.
Only one question at Toronto, my purpose of entering the US. I said I was taking my flight back to the Philippines. Didn't even ask for proof of my ticket, or when I was flying back.