I took my mum to see a production of waiting for godot with hugo weaving at the barbican in 2015.
We were seated in the centre of a row close to the stage and about 20 minutes into the show, some twat sitting in row A slightly to my mum's left pulled out an iPad and started watching the football.
Fully lit screen glowing in a dark auditorium... distracting everyone behind him (and us!)
The actor playing Pozzo had a scene halfway through the first act where he sits and eats a picnic while Hugo's character watches on hungrily. Halfway through a chicken thigh, he leaned forward in his seat and lobbed it straight at the twat on the iPad.
Twat put it away sharpish after that, and didn't come back after the interval!