"I accidentally sent them, may I have them back?"
Pfft. Impossible for you send me BTC by accident, especially with that large of an amount and considering I usually use vanity addresses. As if 1PandaExaY8XmCLSWbAw2prEjbYKgHY2g wasn't obvious enough.
It's your responsibility to double check, and it's your fault for not doing so. Therefore, your stupidity will give you an expensive lesson. By accidentally sending BTC to that address, you are completely giving up and transferring ownership of said bitcoins to PandaLion98, implicitly or otherwise, and it is at his sole discretion as to what he'll do with it (definitely not going back into your wallet). You have/had all the opportunities to make sure that your bitcoins be sent to your intended recipient, but you blatantly ignored them.
Moral lesson: Always triple check your destination address, especially with large transactions.
I'll be sending a link to this post to whoever messes up and accidentally send me their bitcoins.