I have not laughed this hard in a very long time. People at my job were coming up to me asking me if i was ok because i was so red and tears coming out my eyes
See maybe he thought he was playing Battlefield 3? That semtex would have blown up the wall and fallen on the enemy on the other side and gotten the kill!
I love semtex, but have had a few epic fails in which I end up throwing it and sticking it right above my head on something, killing myself in the process.