user-1: I've removed the trivia tag. In my view it veered on the wrong side of meta-tagging to start with. I also always read it as a descriptor meaning something like "this is the kind of question that might be asked during pub quiz", and it was being applied to questions like How are the Lego instruction manuals made? which don't fit that at all. In a broader sense, everything on this site is trivia.
I replaced the ones that actually were trivia with records, all three were about the "biggest" something; otherwise I've just removed the tag.

user63: I'm kinda "meh" on both of these... It kinda seems like you couldn't think up any other tags!
What is the largest single LEGO piece?
Only tag is records. That sucks. What about sizes, identification, history? You'd think there'd be something that describes this with a bit more specificity?
What's the largest LEGO construction ever?
Here again, only one tag. I'd think history would be a no-brainer.
What is the largest Lego kit commercially available?
The only one of the three with multiple tags, and yet even here it seems to be missing the most obvious tag: sets. 
I guess my point is, you're fixated on the wrong problem: we don't really need a "pub quiz" tag, since just about any other tag will have some amount of trivia associated with it; what we need are specific tags that adequately describe the questions.

-1: <p>I've removed the <code>trivia</code> tag. In my view it veered on the wrong side of meta-tagging to start with. I also always read it as a descriptor meaning something like "this is the kind of question that might be asked during pub quiz", and it was being applied to questions like <em><a href="https://bricks.stackexchange.com/questions/239/how-are-the-lego-instruction-manuals-made">How are the Lego instruction manuals made?</a></em> which don't fit that at all. In a broader sense, everything on this site is trivia.</p>

<p>I replaced the ones that actually were trivia with <a href="https://bricks.stackexchange.com/questions/tagged/records" class="post-tag" title="show questions tagged &#39;records&#39;" rel="tag">records</a>, all three were about the "biggest" something; otherwise I've just removed the tag.</p>
 63: <p>I'm kinda "meh" on both of these... It kinda seems like you couldn't think up any other tags!</p>

<p><a href="https://bricks.stackexchange.com/questions/74/what-is-the-largest-single-lego-piece">What is the largest single LEGO piece?</a></p>

<p>Only tag is <a href="https://bricks.stackexchange.com/questions/tagged/records" class="post-tag" title="show questions tagged &#39;records&#39;" rel="tag">records</a>. That sucks. What about <a href="https://bricks.stackexchange.com/questions/tagged/sizes" class="post-tag" title="show questions tagged &#39;sizes&#39;" rel="tag">sizes</a>, <a href="https://bricks.stackexchange.com/questions/tagged/identification" class="post-tag" title="show questions tagged &#39;identification&#39;" rel="tag">identification</a>, <a href="https://bricks.stackexchange.com/questions/tagged/history" class="post-tag" title="show questions tagged &#39;history&#39;" rel="tag">history</a>? You'd think there'd be <em>something</em> that describes this with a bit more specificity?</p>

<p><a href="https://bricks.stackexchange.com/questions/97/whats-the-largest-lego-construction-ever">What&#39;s the largest LEGO construction ever?</a></p>

<p>Here again, only one tag. I'd think <a href="https://bricks.stackexchange.com/questions/tagged/history" class="post-tag" title="show questions tagged &#39;history&#39;" rel="tag">history</a> would be a no-brainer.</p>

<p><a href="https://bricks.stackexchange.com/questions/170/what-is-the-largest-lego-kit-commercially-available">What is the largest Lego kit commercially available?</a></p>

<p>The only one of the three with multiple tags, and yet even here it seems to be missing the most obvious tag: <a href="https://bricks.stackexchange.com/questions/tagged/sets" class="post-tag" title="show questions tagged &#39;sets&#39;" rel="tag">sets</a>. </p>

<p>I guess my point is, you're fixated on the wrong problem: we don't really <em>need</em> a "pub quiz" tag, since just about any other tag will have some amount of trivia associated with it; what we <strong>need</strong> are specific tags that adequately describe the questions.</p>
