False memory

So people, how often do you go to reach for something like a bunch of keys or a book and it's not where you'd swear that you put it?! So that's what happened to me last night, nothing really odd there, but it's just that I distinctly remember taking the keys out of my bag to put something in that I wanted to give to my friend at zumba! Thought nothing of it, until I got back home from zumba and whilst sat in my friend's car went to get the keys from my handbag and oomph they weren't there! But the thing is I was absolutely convinced that I'd left them at the zumba place, we searched and searched the car and emptied my bag which by the way contained only my water bottle, wallet and towel! All to no avail.  Queue the decision then should I go in get my own car keys and go get my spare keys, ( him indoors was home) so it's not as if I was locked out,anyhow two phone calls later I'd decided to go in first, that with trepidation I must add seeing as my beloved LFC was losing away in a champions league match and there is no consoling my sweetie when this happens and I would drive round to my friends to pick up my spare set! So I banged on my window this is customary for those who know us and immediately I got in there they were in all their glory on the corner table, and immediately I remembered putting them there! So why was i so sure that I put them in my bag?   That happens every now and then, and I'm allways so curious as to why we are convinced that we did one thing when we actually did another! It's the same as when trying to remember what we are during the day especially in relation to keeping a diary in regarding weight loss! 

Anyhow was just curious!