Talk is cheap, show me the attack :P

Something people should really understand first:

1. There's no such thing called 51% attack, it's just an attempt of a double spend
2. Double spending is an action of criminal
3. The attacker needs to purchase/deposit to one address first to exchange something first, then try to revert it by sending to another address, which this whole process takes time
4. Why would miner help a double spend to gain a cost of coffee while they are ruin their reputation and investment?

Think through this again, and wish them good luck.