I've been hit hard by big sharks while in a kayak, three times. All three times when they were in a feeding frenzy and my kayak was in line with where they wanted to go. By far the worst and scariest was at night when I could hear the sharks chomping on schools of mullet and was so fearful of getting caught in the mayhem that I pulled up against a sandy shoal to wait until things settled down... they didn't, as a school of mullet was headed straight for me, I could see it coming, I could hear it, and I could feel it as the mullet crashed into my kayak, some jumped completely over kayak and landed on bank flopping around , and others tried to hide in the soft sand under my kayak that was in only a few inches of water as I had pulled as close to bank as I could. It all happened so fast and when the big hump in water chasing them broke the surface I could see its teeth as it had its mouth wide open as it crashed into me, pinning those mullet against my kayak. I was knocked almost completely out of the water and on to solid ground. I'd driven an hour and half to get there, was there for 15 minutes, never made a single cast as I didn't want any part of that kind of action, paddled back to ramp, and drove right back home.
Went back to the same spot the next Saturday during daylight hours and landed what a guide that helped out, told me was a 200 lb bull shark.
First close up encounter with a big shark.. it didn't hit me but cut two big donuts in the water real fast and came within a couple of feet from me.