Using a sharp paring knife, start at the top of the cob and score the middle of each row of kernels. The object here is to puncture the individual casings so that it is easier to force out the contents (as described in step 2). The depth of the incision, as well as your ability to slice a straight line, is of no consequence.
Grab your largest pot and a common dinner knife. Hold the cob inside the pot. Starting at the top of the cob, run the backside of the blade down the cob, using pressure to force out the meat and milk from the casings. Be forewarned, this is a messy job (hence the pot) that requires a healthy amount of muscle power. If possible, do this outdoors.
Discard the cobs and transfer the corn mash to a smaller pot. If you decide to add butter and/or chipotle do it here. Warm over a medium heat for a few watchful minutes, stirring frequently. If you warm corn for too long, or over too high a temperature, the natural liquids will evaporate and the corn will become gooey.
Season with salt and pepper, and serve immediately.
Courtesy Bob Blumer, Surreal Gourmet