There are few nostalgic ones:
getting 230 rune 2h's smithed and selling them at varrock castle after a week of mining rune to buy a pink phat.
pking a rune 2h from a newb after successfully catching him more than twice.
pking on my pure around 2006 when I literally hit 34 33 KO with whip he didn't pot or get to pray, 3 hit in RS2 so I sold the whip for around 2M me thinks.
Oh doing the edge bridge lure for the first time ever, I wasn't even sure if it would work but my longtime friend was doing the talking so a head popped up in the distance, one level lower than me wearing no armour. I blitz, rush with dds and lag like a madman I remember speccing three times somehow and for the 4th spec I clicked on a frozen screen only to lag out. Tried to log back in got account still logged for 60 seconds was mad because it was a huge lure at the time nearly 10M. Logged in a bit later to find my friend logged in when I disconnected and looted 6.7M cash stack and over 800 green d'hides and d bones. It was such an exhilarating moment, kept luring after that.