By: Addison Wylie Legendary British comedy masterminds Monty Python gathered at London’s O2 arena and performed their last show of Monty Python Live (mostly) on Sunday, July 20.  There were plenty of animal puns, ridiculous cheekiness, and spam to go around. Monty Python Live (mostly) opens with a silly song about llamas and leads in with John Cleese, Michael Palin, Terry Gilliam, Terry Jones, and show director Eric Idle performing a sketch about reuniting and oneupmanship…