Actually, you're wrong.
Danny Garcia has trained for years in mountain regions such as the Himalayans, Alpines, and Rockies, doing multiple different hand and mind exercises while exposed to radioactive Kryptonite.
He has attained the power to change the molecular structure of an object simply by touching it, thus allowing him to pass items such as cell phones, wallets, and cards through anything he wishes. He covers up his supernatural power by playing it off as a magic trick - the balloon gives the impression that it is not a serious occasion (for how often do you see a balloon at a serious event, such as a funeral?). This throws the spectator off, which completes the effect.