My first markout moment was the first WWE/wrestling PPV I watched which was WrestleMania 15 when Stone Cold beat The Rock to win the WWE title.

Some various other markout moments not in any particular order:

The infamous CM Punk promo in 2011. Holy shit! Attitude-Era-esque and it had been so long since I had heard a promo go off like that and wow. Always been a Punk guy and that promo is a defining promo in the last 10 years to me.

The first Matt Hardy-Lita kiss. I was a huge Hardy Boys fan back in the day as well as a huge Lita fan and I was young and didn't know all the real-life stuff between them, but to see that was crazy as a kid!

The debut of the Nexus. Ya I know they didn't last but that debut is something that will always stick to me. The chaos that they caused that first night was crazy.

Rock beating Cena at WrestleMania 28. I was rooting for Rock being the non-Cena guy I am but I had the feeling deep-down that the "Golden Boy" was likely going to win considering The Rock was part-time and hardly around but to my shock and excitement, Rocky won. Loved seeing The Attitude Era beat the Cena era.

The entire Shield vs. Ryback/Team Hell No TLC match. First time that I really got to watch the three Shield guys in a match considering I hadn't really kept up with NXT or the indys that weren't TNA at that time so hadn't seen Reigns or Ambrose/Moxley or Rollins/Black, just basically all on reputation. and then you got Ryback who was big at that time and then Team Hell No was on a roll, and that match was so physical and brutal, about as brutal as a match could really get in this era. I was already kinda into the Shield then but I truly "believed" in the Shield after that match. That spot with Ryback and Rollins through the table, holy shit!

any TNA moments?

Kurt Angle's debut, when he headbutt Samoa Joe I was like "Oh SHIT!" cause I was really into TNA back then (a lot more than I am now) that was big

Mick Foley vs Ric Flair last man standing in 2010. Although looking back now, I would say neither of the two really had any business in this match in 2010 (it woulda been better in the 90's then again its TNA) for what it was, it was a hell of a match and showed that Mick even in 2010 still could put on a hell of a hardcore match and he is one of my all-time favorites and I enjoyed the brutality and was like "OH SHIT" cuz honestly I didn't know that Mick still had it in him lol

those are some of my mark-out moments