We all make mistakes when using our computers. Sometimes they are easy to fix, but sometimes not. What's the dumbest mistake you've made? Wiped out your homework or Ph.D. dissertation or new novel by accident? Trashed a client's database without a backup? E-mailed a love letter to the wrong person? Posted your credit card number in a newsgroup? Come on, fess up! I'll go first. I wanted to impress a magazine columnist with my clever analysis of an article he wrote. I pasted in a bunch of text from various sources, intending to pick and choose facts to summarize. I added a few notes to myself. Then I clicked Send instead of Save. I immediately sent an Oops - disregard previous e-mail message but I ended up looking pretty darn foolish. Your turn!