I'll be Upstairs! - A phrase that means you're going to do something embarrassin

A phrase that means you're going to do something embarrassing and hope no one sees it.

I'll be upstairs! (He came back with a shirt that said 'I survived the pizza explosion.')

I'll be upstairs! (He came back with a burn on his arm and a new nickname: 'The Pizza Warrior.')

I'll be upstairs! (He came back with a new hobby: talking to the ceiling.)