well you can trip on Dimenhydrinate (Dramamine) its a motion sickness otc, you trip off it, well its more like getting really tired and then going temporarily insane, you take like 10-12 for this to happen. i did it once i took only 8 i felt really heavy and sleepy i seen the floor start moving like ripples on water, i also went for a walk and kept on seeing shooting stars and shadows looked like people, it also made me very manic more than i usually am, then i fell a sleep for like 20 hours then woke up feeling worn out. its not a partically safe drug so id say do more research under the chemical name on erowid.