The correct response on happening upon a dead Russian spy:
"Thanks, Thalium. Thalium."
PS. Before you write to complain, I realise that the accepted method of murdering naughty Russian ex-spies is with Polonium, not Thalium. And rightly so! Causes far more panic. I would never consider accusing the Russian 'security' services of using an inferior substance. However, "Tholonium" doesn't work as well.
PPS. If you've no idea what I'm talking about, go watch the second episode of "Look Around You" right now. Pay particular attention to the ants.