Everyone has probably seen the TrueFlip Challenge. You submit art depicting a dolphin (the TrueFlip logo) and can win a prize of 30000 tfl tokens.
The winner is the one who gets the most upvotes.
https://steemit.com/blockchain/@trueflip/the-challenge

1 tfl token is .0005 BTC. Therefore, 30000 tfl tokens are 15 BTC. That means the prize is between $30000 and $40000, enough to buy a very good car.

How You Can Win Tokens For Free In Seconds:

1. Upvote this post.

2. Then post your ether wallet address in the comments of this post.

3. Re-Steem for greatest win probability.

4. Distributed reward: In the event of a win, a full 50% or $20000 will go to upvoters!

This is the actual entry which I will submit once getting enough upvotes:

Spread the word! It only works with a win!