Part of what makes poker fun is the different strategies you can use to win.  Tailoring your plays to your individual opponents, taking advantage of their  weaknesses and avoiding their strengths,
Alex McCay has been playing poker for over 20 years and has written many articles on the subject of how to best play the game.  He is also the creator of LearnTexasHoldem.com, one of the most complete resources for players of Texas Hold'em on the web.   Alex's website is www.learn-texas-holdem.com  is what poker is all about. It gives  players an opportunity to illustrate their ingenuity and receive a reward for  it. However, sometimes in poker, it is possible to be too  clever.
Fancy Play SyndromePoker legend Mike  Caro refers to this phenomenon as “Fancy Play Syndrome“ or “FPS.” Essentially,  this means making a complicated play when a simple one will do. 
Here is  an example. You are playing at a 
texas holdem table with an  extremely tight player who usually doesn’t enter a pot unless he has a big hand,  and will rarely continue unless he hits it. You raise with pocket nines and the  tight player calls. The flop comes Qs 8h 4d.
You realize that if he did  not hit a queen you can probably get him to fold. You check, with the idea that  he may bet and you can then check raise, showing extreme strength and winning a  few extra chips.
FPS Example ExplainedThis is an  example of over thinking the situation. If your tight player has a hand like AK,  he is unlikely to try to attack the pot, given the type of player he is. If you  check to him, he will probably check behind, winning you nothing. If he bets, it  almost certainly means he does have a queen. 
Now you will have to figure  out how much to raise to convince him that you can beat top pair. This is all  unnecessarily complicated. If you bet out right away, your opponent will often  fold, giving you the pot. Other times he will raise, letting you know your nines  are no good, and sometimes he will call, letting you see another card cheaply.  In this case, the simplest play is best. The same conditions apply to 
playing  sets. Straightforward play is often the key to extracting the most out of  almost every situation. 
Avoiding FPS
The best  way to avoid FPS is to make an honest assessment of your opponents. If they are  straightforward, non-deceptive players, correct straightforward play will often  win you their chips. If they are savvy, complex opponents they may require more  elaborate strategies, but this is the case less often than you might think. Also  have a look at 
some  good advice from Phil Gordon about simplifying matters in poker.