In NeS1 Post 61, Rob X declares that it was he who was tagged in by Enchilada Man in NeS1 Post 58 so he is 'it'. The then chases everyone around the building to try and tag someone else back in.
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*As Arbiter runs for Geb, Rob X stops them with a yell...*
Rob X: Hey! wait a minute guys! The Taco-Dude tagged me! me! me! I'm "it" now.
*The others shrug, and Rob X starts chasing them. They all run around the whole building while desparately trying to avoid stepping in the slippery enchiladas that the mysterious salesman left, as well as trying to avoid bumping into the old janitor that is cleaning up all the spilt food.*