This is how to shuffle a deck of cards, the PROPER way. With a bit of practice you could become pretty good at it.
Step 1: Deck 'o' Cards
First get a standard deck of cards, 52 cards, take out the jokers. Make sure it is of resonable size, you can't shuffle with a deck of cards 3cm big.
Step 2: The 'Big Split'
Get your deck of cards and split them into two piles, each roughly the same size. Then flatten all of the edges so all the cards are in perfectly straight piles.
Step 3: Shuffle
Grab the two different plies, one in each hand and place your thumb on the top of the card and pull upwards.(shown below) then flick your thumb down the piles and it shuffles. it should look something like picture 2.
Step 4: Good Bit!
This is my favourite part, you have to practice a bit because its hard, but once you get the hang of it, it looks quite good.
First grab the shuffled cards, dont push them in, then arc your hand but push your thumb in to the bottom of the cards. I know i didn't explain it clearly, if you have any question, just ask me. and watch the video on the next step.
Then after that let your thumb or fingers releaseand push the cards down they should jump in to place and look cool.
Check my video for the full steps because this part is not very clear.
Step 5: Video
Sorry about the incredibily rubbish video quality!