All Kevin Durant wanted was a new pair of shoes. Then the space-time continuum showed up, along with Bill Hader, Christopher Lloyd and Tinker Hatfield.

For 10 days, 150 pairs of the Nike Mag shoes will be listed on eBay to benefit The Michael J. Fox Foundation for Parkinson’s Research. The biding has already begun, so to learn more, go to back4thefuture.com.