I'm just running to the store
A phrase you use when you are too lazy to finish your work and just want to go somewhere else
Me: 'I'm just running to the store.' (I left my homework on the floor.)
Brother: 'I'm just running to the store.' (He left me with the dog and his chores.)
Friend: 'I'm just running to the store.' (He left me with a broken chair and a broken heart.)