It just take simple addition and subtraction.
The last one really cracked me up. Poor Bruce, the only way Batman can exist is by his parents dying in front of him =/…
I have to disagree in the Superman one though, green kryptonite’s radiation is poison to him, it doesn’t take away his powers, but kills him instead. Gold kryptonite, however, can take his powers away permanently.
I don’t know who made it, comment if you know.