I've cited Sammy Nestico's "Pressure Cooker" before as the most challenging jazz tune I played on the bass. Bassists don't just have to keep time in that piece; they have to master constant shifting between positions at a breakneck pace.
Recently, I listened to the "Crusaders At Their Best" CD and realized that there's another track that's just as challenging for a bassist. If you play bass, try mastering the rapid shifting required in "Young Rabbits '71 '72."
Any bassist who can play that fast and accurately warrants respect--and an appreciative audience.