Lars Ulrich joined Guns n'roses on stage last on Friday, December 15 during Axl Rose and company's headlining appearance at the Oracle Arena, formerly Oakland Arena, in Oakland, California for a rendition of the GN'R classic "Out Ta Get Me". As you might remember, Metallica did a big tour with Guns n'roses early in the 90s. Since then Axel and Co has been low profile while Metallica has been up and running most of the time.