Try using GIFs if possible, but videos or pictures are fine too if you can't find anything else. There are no rules anyway!
But be cautious with SPOILERS please! Use the Spoiler Tags and give a written warning beforehand if there is a real story spoiler. The written warning might be neccesary, because some people also use spoilertags to hide the huge amount of GIFs too.
Conan saving some minor character just for them dying in the next file:

What Heiji does when Kazuha is about to confess:

