My personal favourite machines for callouts:
No Good Gofers - 'JAAACCCKKPPOOOOT....not', 'This must be embarrasing for you'
Medieval Madness - 'You can't fight...or cook!', 'They took our pinball machine!'
Scared Stiff - 'I'm having multiple jackpots!', 'This thing is huge!'
Monster Bash - 'Let me fetch my sticks!' 'Nobody knows the scales like you!'
TRON: Legacy - 'Behold the son of our MAKER!' 'Most impressive'
and importantly:
Shrek - 'Are you just practising for when you have MONEY?' 'Its even more fun with a pinball!' (things that are said when silly kids run up and think pressing the flipper buttons will make things happen without putting coins in - a nice touch)