You have a glass.
Someone is drinking water straight from the jug.
You are thirsty and the water drinker is not giving up the water jug. And he is pouring water holding the jug far above his mouth to annoy you.
What will you do?
Ojas has the perfect strategy.
Just hold the glass in the path of the water cutting off his water supply but filling your glass effectively while the hapless fellow (Dad) is doing the pouring and wondering where the water is going!