The prankster wrote on the white board “by mistake” and proceeded to Google a “solution” to his error.
The online professor attempts to use his sleeve, a cat and cleaning fluid to erase the marker – all to no avail.
Finally, it’s a Star Wars light sabre that is thrown “threw the screen” to the classroom teacher that saves the day.
“I’ve done this kind of thing several times,” Mr Weathers told independent.ie.
Sasha Brady Tens of thousands of commuters face travel chaos this morning as Irish Rail issue cancellations across DART, Commuter and Intercity services, due to picketing associated with the Bus Eireann strike.

READ MORE ON INDEPENDENT.IE