i think i may have a few but i'll keep it short ( no particular order)
1.buying fallout 76 & not returning that wet bag of **** within a few days
2. agree with Dino Velvet - never should have gotten rid of my old systems (dreamcast as well as my genesis & my N64 with japanese converter for wrestling games) i still have my PS2,PS3, OG Xbox & X360
3. not a regret but a lesson learned - never buy a system when it first comes out. my original bought xbox ( black one ) never worked it repeatedly had issues reading discs. i think i traded it in or may have brought it back to the Wiz where i bought it ( old electronics store back in the day) and explained it was a lemon. i can't really remember if they gave me full refund or what. it was so long ago = 2001! i was really pissed off because i really wanted to play the Star Wars KOTOR game and couldn't. never again - i wait months now even longer ( bought my PS4 1 year after release ) because i have this "never trust the game systems". i am sure the newer systems are good on release day but i'll never take the chance again.