Definitely, I didn't even know that command :D - but I had to `apt-get install sl` on my machine first. Maybe just do a telnet to a nonstandard port on my server and then send special characters to do the animation? That could work...
I always install sl because it helps me. If I'm frustrated from typing too quickly/angrily to even get "ls" right, the little train breaks me out of my fugue state and I have to laugh and shout "choo choo!" in the office :D