You really should never use the square knot as a bend (joining two lines together) as it can spill/capsize. "But under no circumstances should it ever be tied

You really should never use the square knot as a bend (joining two lines together) as it can spill/capsize. "But under no circumstances should it ever be tied as a bend, for if tied with two ends of unequal size, or if one end is stiffer or smoother than the other, the knot is almost bound to spill. Except for its true purpose of binding it is a knot to be shunned." To quote from Ashley. Others refer to it as the most dangerous knot because of the number of people killed by relying on it as a bend.