Athena grabbed the note. Not because she wanted to read it, but because her curiosity of the "magic note" outweighed her common sense.
And when the note got close enough to her, Athena felt compelled to read it. "I wish that I would swap who I'm dating with who the last person who teased me is dating."
Suddenly, Athena's Boyfriend, Grant Westen who is the lead singer in the punk band "Foiled Again" swapped with Steve Farber's girlfriend, Sarah McMillan(his girlfriend in the new reality, because Biff was now a geek). But to everyone else who was not associated with the wish, Athena was supposed to be dating Sarah, and Steven was supposed to be dating Grant.