1. What does it say in the signature line of your emails?
I don't currently have a signature file...but the last one I used was:
Jay Maynard, EMT/P, K5ZC, PP-ASEL | Never ascribe to malice that which can firstname.lastname@example.org | adequately be explained by stupidity. "I'm just a cute little thing...so don't cross me." -- Dot Warner
EMT/P stands for paramedic, which I was at the time; K5ZC is my ham radio callsign; and PP-ASEL stands for private pilot, airplane/single-engine/land. The email address at phoenix.net hasn't been valid for 6 years.
UPDATE: I meant to include here another comment: Long signatures have been frowned upon for years. They waste bandwidth and readers' time. The kind of stuff folks in, for example, alt.festivals.renaissance put in their messages - which seldom are less than 20 lines, and often exceed 100 - should be put on their web pages instead and pointed to by a URL in the signature.
2. Did you have a senior quote in your high school yearbook? What was it? If you haven't graduated yet, what would you like your quote to be?
Didn't have one. My yearbook didn't have such things. I'm not sure I'd have put one in if they did.
3. If you had vanity plates on your car, what would they read? If you already have them, what do they say?
K5ZC. Not strictly vanity plates; nearly all states offer hams special plates with their callsign on them, with special markings labeling the plate as belonging to a ham, for a reduced fee compared to vanity plates. Ham plates in Texas cost $1/year extra; vanity plates in Texas cost $45/year extra.
4. Have you received any gifts with messages engraved upon them? What did the inscription say?
5. What would you like your epitaph to be?
Hm. Haven't thought about this one. Not sure I can think of one, either. Far too little can be said in the space available, and any summation that would fit would be necessarily inaccurate.