My very first rollercoaster was 'keverbaan' in Slagharen (The Netherlands)
I really liked it back then.
My first coaster with inversions was Python in Efteling. My parents tricked me to ride with them, saying it didn't go upside-down. I found out by myself that it did go upside-down, while in the queue. But by then I didn't really care about that anymore, so I just rode it and I loved it. It was the first step to becoming an enthusiast. (The second was riding Goliath at Walibi Holland)
~Sneaky