...where you kick yourself for not doing something at an advantageous time, that could have brought your fame, or fortune, or both, or something else valuable to you?

I'm having one right now, realizing that I could have bought two PS3s and sold them on Ebay and make thousands of dollars profit, even considering the $1300 initial investment.

Ya, I'm a dumbass idiot (let's not be too harsh now...)

Let's assume I could have sold each for $5000, that's $10000 minus the $1300 spent gives me $8700 to spend on the laptop I've been after for a while (the reason I have $1300 on hand) - $1700. A 24" 30" LCD - about $2000. And to power that behemoth, a GeForce 8800 GTX, which is $850 or there abouts. That still leaves me $4150, so why not throw in about $2000 for a new Core 2 Duo computer, and even that's fairly modest, I could go higher...

Point I'm trying to make here is, I had an opportunity to buy all the things I want right now, and STILL have change to maybe buy a PS3 for keepers. And I hate myself for not exploiting it.

* None of these measurements should be considered totally accurate on account of my being too lazy to calculate taxes into them or even look up actual prices.