Person: OMG OMG OMG. i did something bad i littered on accident! they're sending me to the worstest prison ever!
person2: You mean TISB?

Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...

You can't take sick leave unless you show up for work, but if you show up for work you're not sick? TISBS!