ATF is supposed to be real creeper weed. I remember creeper weed back in the mid-late 90s. You thought you weren't high and then BAM. Super stoned.
The strongest weed I've ever had was in '95. It was brick, dark brown with golden and purple highlights. It was kind of stringy too, like tobacco. If I had to guess I'd say it was Mexican but it easily could have been Thai as well. It was a creeper strain also but had such a punch to it I heard 'whomping' noises circling my head and I thought I was going to die. I was with a friend hanging out by a lake, near to the center of the town I grew up in. I lived on the other side of it, so it was a half mile or so away to my house. I had biked up there with him on my rear pegs. I couldn't even begin to ride straight. He peddled us home, chanting "Oh my fucking god____. Oh my fucking god man. Oh my fucking god.". I told my parents I thought I was going to die and they flipped on me, or my mom did. They took the weed and warned me it could have been laced. I found out later my stepdad smoked it with some of his friends and they all thought it was good stuff.
I think I've smoked kind buds that were as powerful since then but just had more experience in the mind to deal with it...