Senility

[Zippo]

I generally know what I have with Transformers, so the only time I get doubles is if I want doubles OR I see something locally just after importing it and the import hasn't yet arrived.

Hot Wheels on the other hand - I get doubles and triples ALL the time as I can never remember what I have when I see a new case.

[griffin]

I did that twice this year at BotCon - buying something I already had, or had in transit (which meant I had only just recently bought it, so should have remembered it ).

[loophole]

I haven't bought doubles of toys at least accidentally anyway.... but i have done this with my spiderman comics a few times now, i look at the cover and think oh i don't have this one but i actually do so nowadays i keep a list on me at all time.
Although i still manage to double up sometimes with the newer comics as my list is only for the vintage stuff.

[UltraMarginal]

I haven't bought doubles of toys at least accidentally anyway.... but i have done this with my spiderman comics a few times now, i look at the cover and think oh i don't have this one but i actually do so nowadays i keep a list on me at all time.
Although i still manage to double up sometimes with the newer comics as my list is only for the vintage stuff.

I've done the same with Phantom Comics, left it for a couple months, gone in and bought a bunch, get home and there's an overlap in what I bought and already have. Now I keep a note on my phone with the latest issue number that I need to start picking up from.

[Deonasis]

Sounds like you have toys in the attic and some of them are broken!!
Best hand over the keys to your collection

[LordCyrusOmega]

I don't really forget things. My memory went a bit loopy after a head injury earlier this year but it seems to be correcting itself now.

[swoop]

I always forget if its the clear or black ehobby hot rod that I have but apart from that I don't have any real difficulty remembering what I have in my collection.
Although I have come close to doubling up on some of the movie legends toys, most of the repaints are so similar its easy to forget what you have

[tinyJazz]

I'm a bit like Jay, I document all my tfs in a spreadsheet so I don't usually have this problem. :/ I also keep a "wants list" and "ordered list" updated on my phone so I can check while I'm out. Also I can get worried if something on my ordered list isn't turning up in the mail, or CROSS IT OUT when it does arrive - it's so satisfying!

"Good news everyone! I have doubles of my Generations toys!"

[1orion2many]

I'm too lazy to keep track of everything, I suppose I should. I can always look on the bright side, I'll have plenty of sealed doubles to sell later on down the track

[bowspearer]

Not so much buying but with stuff in transit- several times I'll forget what I hve in transit, only to have a package turn up, open it up and go "Oh yeah, that's right, forgot that was coming".