I should have stayed in bed

I should have stayed in bed

I should not have bothered doing this because it wasn't worth the time or effort. Primarily heard in US. We got trounced at our football game this morning—I should've just stayed in bed. A: "So, what did you think of the opera, Dad?" B: "Eh, waste of a Sunday if you ask me. I should have stayed in bed."
See also: bed, have, should, stay