Best. Teacher. Ever.
During algebra, half the class went to the teacher to said they hadn't made their homework and half said that they didn't bring algebra because they forgot they had it. All in all, the teacher was troll'd.
My school doesn't allow April Fools pranks, but that didn't stop my language arts teacher from doing one on March 31th.
(The intercom turns on, and the student aide starts saying the announcements)
Teacher: Alright class,remember that due to your county exam tomorrow,you will have an early release day!
Everyone: Hooray!
Kid in the back rows: Wait,isn't tomorrow April Fools?
In the computer lab I reversed all the ethernet cables, lossened the USB cables for the mouse and keyboard, and then plugged my own keyboard and mouse into my neighbour's computer.
I logged on to the teacher computer (we have active directory so all computers are the same), used ctrl-alt-down to flip the monitor, and then logged out before the teacher got there.
I would always do that, but my new school uses crappy macs
I printcreened the desktop and hid all of my dad's folders, start screen, etc. then flipped the screen. after that I remotely controled his computer and messed with him for a while there.