Student presenting powerpoint presentation in class:
Teacher: are you ready?
Student: yes sir just have to position my phone properly and start it up. 'projector turns on'
Teacher: what is your topic?
Student: today i'm gonna talk about ..... 'screen goes blank'
Teacher: what just happened?
Student: my phone battery died... damnit i didnt know i need a power cord
Teacher: dismissed - F for presentation