The only time I've been able to trip with regular Ipomaea [sp?] morning glory seeds was with insane amounts, such as 1250 seeds. It may have been because they weren't very high in potency, but I've tried other brands and varieties and they all seem to take at least 1000 seeds for me to catch even a light trip. After I read this post (about an hour and a half ago), I looked through my drawer and I found 15 grams of heavenly blue seeds. I crushed them up and drank them with some orange juice, and the only thing I feel now (about T+01:10) is some minor stomach discomfort and an odd taste in my mouth.
Also, the first two times these seeds worked for me, I had bought some nitrous. The first time, I walked up to the park in the dark and did one, noticed it was alot stronger than normal, and over the next twenty or so minutes I did another three of them and it went from feeling nothing from the seeds I had taken three hours earlier to seeing brilliant kaleidoscope-like patterns everywhere, especially after hitting up a nitrous. The whole night after that was really great with fairly good visuals and lots of laughter. The second time was pretty much the same, but I had stayed in my room and did the nitrous. I just thought it was weird that the morning glory trip started as soon as I hit the nitrous for the first time during the trip.