What is the best game/demo or 2-player-game to show to a non-MSX friend?

Don't forget Rotors!

EDIT: oh, hap already mentioned it.

@ FiXato: Yeah!!! If it gets too crowded we can always rent some place, hehe.

@ manuel: nope, really Buta Porc (or Butaporc). It was on some special T&E Soft disk.
It involves 2 pigs in a gym, blowing breath to keep a soap bubble in the air. Who lets the bubble pop or land it into the other pig's basket gains points.

Some kind of promotional stuff - I think it actually consisted of 2 disks.
Besides Buta Porc, there was a parody of Laydock 2 on it called (translated) "Ahmiyadog" (like in [a scream of a guy], [meeow of a cat] and [dog]).
Apart from that some pictures and texts, I think.

Anyway, Buta Porc can be downloaded separately from a certain site.
Maybe the Laydock 2 parody, too.

Looks like this set of disks is missing in GenMSX indeed. The disk image I found is called "T&E Disk Pack 1" (and 2), but the disk itself opens with Pana Amusement Collection Disc, Matsushita 1989.

Ikari warrior / bubble bobble