A Memorial Day trip off the Texas coast took a dangerous turn when a 17-year-old was bitten by a shark while aboard a recreational boat near Galveston. The teen was injured while trying to haul the shark onto the boat. His father then reportedly applied a tourniquet to slow the bleeding before rescuers arrived. What's happening? According to Fox Weather, the Coast Guard said watchstanders in Sector Houston-Galveston were notified around 3 p.m. b…