My usual advice is to go ahead and introduce the thought, even if there doesn’t seem to be a natural “hook” for it to hang on in the conversation. That might very well come off as abrupt, out of the blue, or even rude… but if your norm is to stay quiet for lack of such a hook, it’s unlikely that reasonable people will be too offended by it. (Unless, of course, they are the sort who are offended when anyone else behaves like their conversational peer, but that’s a bigger issue.)
My usual advice is to go ahead and introduce the thought, even if there doesn’t seem to be a natural “hook” for it to hang on in the conversation. That might very well come off as abrupt, out of the blue, or even rude… but if your norm is to stay quiet for lack of such a hook, it’s unlikely that reasonable people will be too offended by it. (Unless, of course, they are the sort who are offended when anyone else behaves like their conversational peer, but that’s a bigger issue.)