BENGALURU: Online classes are giving back-benchers more room for mischief, all because a large number of their teachers are not tech savvy.A video of a teacher asking students to change their profile ids from ‘Osama Bin Laden’, ‘Lallu ki tapri’ and ‘Rathi ma’am best teacher’ to their real names with roll numbers so she could mark attendance, even as a ‘Mia Khalifa’ (a porn star namesake) joins in, is a huge hit on social media.“Students log in with nicknames like ‘I’m corona’ and ‘cute girl’. You cannot identify who has joined and who has left. Sometimes, their family members also join the session and it’s very embarrassing,” said a guest lecturer at a girls’ college.A student of a Jayanagar college said: “Once, our whole class pretended not to hear the teacher. We made her repeat herself so many times she discontinued the class.”Zoom bombing is the flavour of the season in engineering colleges. “Some students send links and password to outsiders who join the classes. We won’t know they’re around unless they ask unrelated doubts or make weird noises. Things are better now with new features on this platform,” said a final-year engineering student.Degree college teachers, who are not too well versed with online platforms, have a tough time controlling students. “In one of my earlier classes, students started scribbling on my white board, changed slides during my PowerPoint presentation and chatted away. I’ve learnt how to disable certain features so I can teach without disturbances,” said Bharathi A, a teacher at Government RC College.A student said: “Once, pranksters merged two classes and the lecturers started teaching at the same time without realising the other was also present. The teachers warned us they’d find out who did it, but they couldn’t. Teachers have started using other platforms instead of relying on Zoom.”Some mischievous students mute their teachers, turn off video inputs and go to sleep. Some play trending Instagram tunes in class.“Sometimes, students mute themselves and leave their seats. In a class of 60-70 students, it’s not possible to check if all students are tuned in. We try to keep our classes interactive,” said a professor in the department of communication, Bengaluru Central University, who spoke on condition of anonymity.A dental student said: “Sometimes, students take a few minutes to respond to questions. If they’re directed at one person, we have to give missed calls to wake them up.”However, some pranks can be very offensive. A secondary school teacher in Whitefield was shocked when a student started playing a porn clip during a Zoom meeting. “It’s sad that teachers are mercilessly teased and helpless in keeping students in check,” said an engineering student.