I almost did that yesterday in a Deep Stacks tourney. I sat out to leave the room, and when I came back, saw that I had AA in the BB. I furiously clicked on "I'm Back", and got back just as the player on the button shoved. I insta-called and busted his A9o.
The others at the table thought I was sucking him in, and I can see how that might look like a move. Course, he could've just made a sensible raise if he wanted to isolate my undefended BB.