How to make a thread wait until another thread finishes?

For girls only: Is this a good Prank to play on your overweight sister who is 1 year younger than you?

• & is always playing pranks on you Take her one piece bathing suit (that covers up her fat) and cut it into 8 pieces Then use Water Soluble thread to sew it back together in a sewing machine (so it will look real) If you want her to laugh and forgive you wait till she goes swimming with only you in a pool and make sure she wears the reconstructed swim suit. after the water dissolves the Water Soluble thread and her 1 piece bathing suit breaks into 8 pieces throw her another bathing suit to put on If you want her to be angry at you for a very long time wait till she goes to a water park or to a pool with her friends make sure she wears the reconstructed swim suit wait till the water soluble thread dissolves in the pool water and breaks into 8 pieces and her body and body fat is exposed to everyone and see what happens

• Answer:

  ignore those other guys i think this is the best prank i have ever read, you gave me a sweet idea.