Top Ten Signs: 10. It's hosted by Ed McMahon. 9. "Amplifiers" are just enormous Dixie cups. 8. Every song contains a plug for Green Giant frozen vegetables. 7. You're asked to put on a hat and sunglasses and the next thing you know, you're being introduced as Bob Dylan. 6. One word: polkas. 5. Guy sitting next to you brought a glove and has caught three foul balls. 4. "Santana" turns out to be a jolly bearded guy with a sack ful of presents. 3. They're playing "May we turn the hose on you, pleas…