The Litter Lunatic has been at work again. I came home tonight from seeing a play (The Persian Revolution) to find this in the lift.

To add to the effrontery it contained some liquid so after I had removed it here's what was left on the floor.

It's hard to know what to do but I think I will have to engage the factor and the residents' association in reviewing possibilities.

The impossibility I personally favour can't be described on a family blog but would be familiar to Persian revolutionaries.