Money wise I once ran a speed lab and lost a couple grand on it after my associate chikened out because his half brother got whacked. But it was fun.
Overall. I studied for an acounting tecnician in my teenage years. Thats what i regret the most in my life. No human being should go through that. One of the reasons i dont have a college degree is tgat after going through that i sworeupon my soul and upon the mass that i would never again go through anything similar.