As silly as it sounds, I use the technique of using of using _really_ informal language to avoid spookiness
"Wanna see somthing cool?" "Lets shoot the shit after this" "Yo, you wanna hang for a minute at 4"
"Wanna see somthing cool?" "Lets shoot the shit after this" "Yo, you wanna hang for a minute at 4"
if it works for headlines, why not messages to your co-workers?