​get revenge on somebody by planting running bamboo somewhere inconspicuous in their yard

fun facts about bamboo:

fastest growing plant in the world (up to 1″ per hour in ideal conditions)
spreads quickly through its roots which grow horizontally and criss cross the ground like a bunch of ropes
shoots grow vertically from the roots and are strong enough to pierce concrete, potentially causing massive damage
can completely regenerate from a small 1″ piece of a root in the ground
forms dense forests 30ft tall
is difficult to mow down because of the sharp wooden-like spikes that grow out of the ground everywhere nearby
is almost impossible to eradicate once established
they used to torture people in vietnam by tying the person to the ground so they couldn’t move with a bamboo shoot growing under their back. it would grow through them long before they died of thirst.