Save the roaches from your joints and combine the resonated pot into a new (more potent) joint. If planned correctly, this technique can be repeated endlessly, producing high-potency grandparent joints and even great-grandparent joints.
"Looks like we've got enough here for a Grandparent joint, anyone down?"
"I have been saving the great-grandparent joint of last summer for my backpacking trip."
1- Step-great-grandparent's parent.
2- Great-grandparent's stepparent.
My step-great-great-grandparent is a good person.
The great-great-grandparent of one's spouse.
My great-great-grandparent-in-law is a good person.
Spouse's great-great-grandparent.
My great-great-grandparent-in-law is a good person.