When an obvious homosexual makes prolonged eye contact with you in a pub/club.

That creepy look old people with the pedo stache and the baldness give you. Don't let him molest you.

When one of your animals is on your lap, and when you start to push them of to get up they stare at you. A look in their eyes that says “don’t leave, otherwise I’ll be sad”. You love your pet so much that you don’t move and don’t get anything done for the rest of the day.

When leaving a single serving bathroom after dropping a shitbomb one obviously looks to avoid any immediate human interaction in order to avoid defecation guilt for desecrating the toilet area with stank nastiness. However, the instance in which one makes eye contact with the poop desecrator his/her face is flush with shit guilt, hence giving up the shitter stare...

When someone has a look on their face that suggests they are about to, or have already, killed someone.

What you call a friend when they look pissed angry at you.

When someone has a thousand yard stare