I love Roombas, yet if they get too dusty (and they are darn hard to clean) they stop cleaning and go infinitely in circles. This is called the "Circle Dance." (Explained here: http://en.wikipedia.org/wiki/Roomba)
"The Circle Dance"
’Bots can dance if they want to,
’Bots will leave your ‘droids behind.
Cause your ‘droids don't dance,
And if they don't dance,
Well they're no friends of mine.
‘Bots can go where they want to,
A place where we'll never find,
And ‘Bots can act like they come from out of this world,
Leave the real one far behind.
‘Bots can dance!
‘Bots can go where they want to,
The night is dark and so am I.
And ‘Bots can dress real neat,
From their claws to their feet,
And surprise us with a beeping cry.
‘Bots can act if they want to,
If ‘Bots don't nobody will.
And ‘Bots can act real rude,
And totally removed,
And can act like imbeciles.
I say, ‘Bots can dance, ‘Bots can dance,
Everything is out of control!
‘Bots can dance, ‘Bots can dance,
They’re doing it from wall to wall!
‘Bots can dance, ‘Bots can dance,
Everybody look at your 'droids!
‘Bots can dance, ‘Bots can dance!
They dance on asteroids!
The Circle dance
‘Bots will Circle dance
Yes, the Circle dance
‘Bots can dance if they want to.
‘Bots have got all your life and mine.
As long as they abuse it,
Never gonna lose it,
Everything will work out right.
I say, ‘Bots can dance if we let them,
‘Bots can leave your ‘droids behind.
Cause your ‘droids don't dance,
And if they don't dance,
Well, they're no friends of mine.
‘Bots can dance, ‘Bots can dance,
Everything is out of control!
‘Bots can dance, ‘Bots can dance,
They’re doing it from wall to wall!
‘Bots can dance, ‘Bots can dance,
Everybody look at your 'droids!
‘Bots can dance, ‘Bots can dance!
They dance on asteroids!
They Circle Dance!
‘Bots will Circle Dance!
Yes, they Circle Dance!
(c) 2011 tjm