I was playing Tf2, and I realised the best way of making sure no one destroys your sentry. Get a friend to spray a 2 girls 1 cup tag right above it, and I can assure you, it will NEVER be destroyed.
So, as you're no doubt aware Team Fortress 2 is back on my list of games that make me scream like a little girl. I posted the other day about how it had changed a lot, and part of me still thinks a lot of the so called "Improvements" are too gimmicky to ever fit in correctly, it is still a fantastically fun game that really does keep making you come back for more.
Oh, and if you want to see a picture of the sentry blocker? Be aware, this thing isn't suitable for work in any way.
Click here, if you dare.