Tip for the day

You rode your bike last in the rain, you brought it inside, parked it and gave it a quick wipe down. The next day you hop on it and start to ride, right away you notice the rear brake pedal does not feel right. It isn't returning to the full "up" position after use. You suspect water has gotten in the pivot area and perhaps the area needs re-lubing. You ride to the hardware store, pick up a can of WD40, CRC, or an equivalent and spray it on the pivot point where the pedal rotates on the forward peg and the area where the brake rod pivots on the pedal post.

Working the pedal, you notice that it is still working stiff. better than it was but stiff. So you decide to spray the area where the brake shaft meets the rear brake cylinder. With the extended nozzle on the spray can you insert the spray tube down into the area of the rear brake cylinder. To control the spray better you use part of the bike to steady your hand against. 

As shown in the photo above, the area indicated, (the rear cylinder exhaust pipe) is not the best thing to press your hand against while applying the lubricant. First there is a sizzling sound, and you actually get to see steam, as the moisture is ironed out of our finger.
What you have done is given yourself a 2nd degree burn, a blister, but because you applied so much pressure you have gone beyond that to cook through the blister, popping it, hence the steam. This all happens real fast. All before the first inkling of pain arrives. 

So...
pay attention to what you are doing, sure you just walked out of the store and the bike wasn't running when you did this, but it was...for about a half hour....before you went in the store, 
remember?

Yes it could have been worse, it will heal, it really isn't all that bad and yes, you are a moron.