Any person who gets wasted in the nosebleed section can make their way to the field or court, hop out of the stands and cross that line that separates fan from "idiot." Sure, those who are willing to stumble around—until they're tased into submission by a handful of winded security officials—can be highly entertaining, but there's nothing special about the effort.
Streakers, field-crashers and other random fans-cum-disruptions may find their way onto YouTube, but they'll soon be lost in a sea of search results.
If a fan wants to have a lasting impact, then they have to do something that is unique or well planned, or both. This is what separates an incident from a prank. A truly awesome prank is near art—a scheme that knows its victim better than they know themselves.
And this doesn't mean every awesome prank is a hilarious, thoroughly planned scheme; something crazy can assume legendary status even if it didn't demand blueprints, counter intelligence and a goat. What's most important is the spirit behind it.
These are the craziest fan pranks in sports.