but SHOULD NOT generate or store that password on lastpass.com or ANY third-party password service. Use of such a service is placing the security of your information in the hands of a third party. That's NUTs.
First study how LastPass works, then post. They don't hold your passwords. They cannot retrieve them.
Can someone explain to me how/why lastpass.com is better than your browser's password store? I use pwgen to generate seriously crazy passwords for each individual site and let my browser remember the passwords. Nobody has access to my computer except me, and even when they do, it's through their own account.
Your browser store is at risk of being easily broken into by a client side web browser exploit.
I'll just repeat what so many have already posted: Use LastPass. Generate a new 12+ char password for each site you use. Sleep well.