I'll be Upstairs! - A lie told to people who are too dumb to realize you're abou

A lie told to people who are too dumb to realize you're about to do something stupid.

I'll be upstairs! (He came back 2 hours later with a tattoo of a pizza slice.)

I'll be upstairs! (He ended up getting locked in the fridge.)

I'll be upstairs! (He took a selfie with a ghost and posted it on Instagram.)