Ir is different from irse (with pictures)

7 Answers
ir = to go someplace in particular
irse = to go somewhere other than here, leave, get out
Edit - Examples:
Voy a la tienda = I am going to the store
Fuimos por avión = We went by airplane
Mis padres se fueron ayer = My parents left yesterday
¡Vete! = Go! (Get out!)
Hmm ... obviously I'm a bit slow tonight. Let me see if I've understood this properly.
Sñr Super says "... tiene que ir ahora mismo". The other bloke (being an idiot) leaves without knowing where he should go because Sñr S. didn't say "... tiene que irse
Did I get the joke?
I guess I should have clarified what I mean by my title.
Imagine you are with a friend of yours in a party, and all of a sudden, he says:
I'm going!
That makes perfect sense in English, but not in Spanish if you say "Voy", because it is a verb that focuses on the destination above all. A verb whose only point is to indicate a destination makes no sense without one, which is what the comic is using as a joke: Mortadelo "goes" (se va) without hearing the destination, and the "súper" wonders how can he be so silly as to "ir" without knowing where.
The "súper" wanted him to "ir [a un sitio]", and he "se fue" instead.
I don't know whether I'm making any sense.
The comic explains it very well, but if you have trouble remembering the difference, try this: Irse = Largarse
It is simple. "Ir" is to go and "Irse" is to leave.
Well, the comic + the discussion is a big help. Really clears it up for me.
irse is go to and ir i go