Here is one of the more stupid things I've done recently (mainly as I can't think of any other examples).
I was using Ludicargo, my opponent was using a random deck with Salamance (Ds), Rayquaza Ex (Df) and Mewtwo (Ds). I decided it would be a goo idea to concentrate on getting my then teched in Gardevoir Ex (Df) out for the first time ever to shut off Rayqauaza's body. With 2 Magcargos and no Ludicolos out, that took a while. He took 3 prizes and put 50 damage on a Magcargo thanks to a Rayquaza with 2 energies attached, and a Salamance with 4 Energies attached and a little damage and a Mewtwo with 2 energies, while I had drawn 0 prizes, but had a fully powered up Gardevoir Ex and another Magcargo with scramble attached. I put up Gardevoir Ex, Imprisoned his Rayquaza (as if it mattered) and did Flame Ball. I thought he would kill off my damaged Magcargo, but instead, he did 50 to Gardy Ex. I Smooth Overed for a Crystal Shard, K.O'ed his Rayquaza and put Holon's Magneton on the Magcaro with scramble attached. He K.Os Gardy with Salamace. I put up the Magcargo with energies, attach Crystal Shard for the K.O. He puts up Mewtwo. I thought I was safe, thinking he couldn't K.O me and I had a Ludicolo on the way. He attaches FTW. I wish I remembered about those pesky energy cards...