Cut out a small circle at the top of the pumpkin, big enough to comfortably fit your hand in. Using a spoon, scoop out all the centre of the pumpkin. Cut out eyes and a mouth in any style you fancy, preferably resulting in the pumpkin looking unwell!
De-stone the avocados and scoop out the flesh into a bowl. Mash slightly with a fork, ensuring a smooth but still chunky texture. Add the onion, tomatoes, coriander, lime juice, garlic, chilli, olive oil and seasoning. Mix further until desired texture. Taste for further seasoning.
Place the pumpkin with the mouth facing the plate and scoop the avocado mixture coming out of it, vomit style. Add chips and tuck in!
For a creamier guac, add a dollop of soured cream.