I hate when application is lying to me. For example when it says my message has proper length, in this case maximal allowed length (showing 0 characters remaining), but then throws some random error message like "Your comment is probably blank.". But when I apply some magic, like when I remove 2* characters from it, suddenly it's working as expected. (Removing 1 character isn't working, hence the magic.)

PS: This does devRant Android app and web version as well.