When I hit the “-” -key three times in a row (—) in a text document, there appears a little “smiling face” instead of every third “-”. Is this an “easter egg” or an edible option? At least it’s funny 
Tested and reproduced on Beta 26 with font Candara.
To recreate the bug, simply tick “replace double hyphens with em-dashes” under File > Options > Corrections > Substitutions.
To disable the bug, untick the above setting. This does mean no longer having em-dash substitution however.
If I type two hyphens, the em dash does not appear. If I type three hyphens, the em-dash appears with a hyphen attached. I can delete this additional hyphen by hitting space bar. However, if I choose to add a fourth hyphen instead of hitting space, or hit delete and try to put my hyphen directly next to the em-dash, a smiley face appears instead of a second em-dash. I can however delete the spaces between existing em-dashes without making more smiley faces. Something odd is going on with the character substitution here.
This egg has been there for a while (Beta 16? maybe earlier). See [url][NB] EM dash - #10 by rwfranz]. Labelled NB, which I assume means No Bug.