So we have a thread on carrying in a boat and the funny off-topic thread on cutting a ball out of a catfish's mouth. Both are situations where keeping your knife (or even a gun) on a lanyard is a good idea so your precious tool doesn't end up at the bottom of a murky lake when you're using it.
I've also heard of a gun or two dropping into the deep blue yonder of a porta-john. (Those probably were the results of bad holster retention.)
So who here actually uses lanyards on their gear?