I wasn’t born yesterday, and neither were you.
When you call me with a problem and tell me that you “don’t remember” what you did, I know that isn’t true. I know that when I arrive, it will be obvious what you did. You tried something, it didn’t work, and now you’re embarrassed to admit that you’ve gotten stuck. However, the best ruse you can devise to avoid this apparent embarrassment is to tell me you “don’t remember”.
Claiming you “don’t remember” something you did 3 minutes ago makes you sound like an idiot. Or potentially the protagonist from Memento. Mostly, just an idiot. Certainly much more of an idiot that someone who actually tried to work something out for themselves, which is what you did. Just because you got out of your depth doesn’t make you look foolish. Claiming you have a lesser mental capacity than a 9 year old? That does.