yes, i cross-threaded my spark plug.
now i'm looking for a shop with the back tap tool - it's a tap that you push past the spark plug hole threads then engages and grabs the good threads and cleans up the rest of the threads on the way out.
i've contacted essential, windbell, 5thgear, carter honda. any shops you know of that have the 12 mm version? otherwise i'll order this one-time-useful tool.