Probably because I ate all those sandwiches

A go-to excuse for why you did something for no reason

Probably because I ate all those sandwiches should not be used when describing why you ate all those sandwiches. Do not include a time period that you ate all of those sandwiches

John: "Hey Chris, why'd you ask Marissa out? You don't even like black chicks."

Chris: "I don't know. It's probably because I ate all those sandwiches."