Irony
The below is paraphrased from memory. But it struck me funny...
Context: Folksonomy, or How I Learned to Stop Worrying and Love the Mess
Question: (Marc Cantor) have you guys every thought about crosslinking your tags?
Answer: (Joshua Schachter) While we all use the word tag to describe what we have created, we each mean something completely different by the term. We need to think some more before we crosslink.