Stalkers are usually no laughing matter. But it's hard not to find humor in Marce William Burchell . . . a man who has written a 30-page book about his supposed affair with JESSICA SIMPSON.

Check out the title of this thing: "The True Story of Jessica Ann Simpson's 22 month long attempt to seduce a married man - her very Active Super Secret Sex life: True Story Jessica Simpson Seduction of A Married Man (Volume 1)".

Yes, that's the full title of this thing. Burchell claims this book blows the lid off of how Jessica cheats on all her men . . . including TONY ROMO and her current fiancé, ERIC JOHNSON. Not to mention how she ruined Burchell's life.

This might be the best part of it all: The book costs a hefty $30, but Burchell claims that all proceeds are going to the development of a revolutionary new electric car that will only cost $10,000 to buy and will, quote, "make all gasoline-powered cars obsolete."

Here are the specs on this beauty . . . quote, "It can carry seven passengers and cargo, has a top speed of 180 miles per hour, can go 300 miles per charge and accelerates from zero to 60 miles per hour in less than 4 seconds."

As for why he wrote the book, he says, quote, "This book was not written to hurt her, but was written as my only way to heal emotionally from the severe trauma and pain she put me through by her heartless cruel treatment of me."

Not surprisingly, Jessica's security team has a profile on this guy. He's been bugging her for years. (--If you'd like to purchase this beauty, it's on Amazon. Here's the link.)