How about trying to read mail while riding no hands (ie - not watching where I'm going)?
I looked down in time to see a curb coming up fast, grabbed the bars, jammed the brakes, and came to a stop with the wheel against the curb, endoing amazingly slowly and landing soft as a feather in bark dust.
The next night I tried to jump the ramped transition between street and sidewalk in poor lighting. I overshot the sidewalk, jammed my front wheel against another curb, and endoed hard. This was about 50 feet away from the spot I endoed the night before. This one was not soft. Look before you leap.
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