Hoisting ones own petard
I have never known exactly what a petard is, but I know that you don't wish to be uplifted by ones own.
I was met by a fascinating scene a few weeks ago near Slade Heath Bridge (Coven) where some folk appeared to be erecting a gallows on the front of a narrowboat. Now I know that boating has been getting expensive lately, but this seemed to be an extreme way of expressing disappointment.
Ten out of ten for ingenuity and dogged perseverence! Get well soon good sir.