So, ZZ Top's Billy Gibbons sat in with Guns N Roses last night in Houston, which is great, bless 'em all. However, Patience may not have been the best song for this. You can see Slash and Richard Fortus trying to show Billy the chords, and later Billy taking a stab at the lead, but's it's all a bit (endearingly) train-wreckish. See for yourself: