User blog comment:DaNASCAT/Technical Update: May 6, 2014/@comment-1192804-20140507191529/@comment-1038387-20140507194931

That same problem also goes for long usernames. I've seen cases where the caption is three lines because someone thought it was fun to have a long username.

We solved that by using a special {Image|} template that tucks all of that away and displays the image in a clear, easily distinguishable box. Except, like you said on the 470 videos... only a handful of pages have it so far.