Why do PIRATE captains always have a hook for a hand and a peg for a leg?

My son's pirate birthday party netted him a toy pirate set - which featured a captain who had both a peg-leg and a hook-hand... Why? I thought it was one or the other with pirates - but lately, I see both. That's just overkill.

What kind of luck do you have to have to lose BOTH a hand and a leg? That's not the kind of leader you'd want captaining YOUR vessel...

Being bossed around by a guy without a couple of appendages would be creepy, sure, but why would you put up with it? Clearly he's not the strongest guy on the boat (at least not anymore), and he's OBVIOUSLY not the smartest... so why is he still the captain?