You might have thought it was funny to remove the ink cartridge from my pen. I can't fathom why you did that. I know I left it on my desk, and that was my fault. If I'd have left it in my drawer you'd probably never have done it. But why the ink cartridge? Why not take the whole pen? If you'd have taken the whole pen, I'd have had a good one ready when I had to make a laundry list of things to do for the customer I was talking to when I discovered it wasn't working. Instead, I had to apologize, stop him from speaking, grab another pen, and then apologize again before asking him to repeat what was going on.
Taking the pen would have been understandable - you needed one and I left one out. Fair enough. But taking the ink cartridge? That's a pretty crappy thing to do. All it says is that you wanted to crap upon my day.