Hmm i've done it like 7 or 8 times. the last time i did it was during school and i freaked out. i only took like 4 benadryl and 2 dramamine just so it wouldn't like be obvious to people. oh god it hit me hard for some reason and i was freaking... weird. in my study hall class this bag and bottle were rapidly shaking and everything was sliding around. It's fun but i hate the drowsiness. i get so irritable.