The most embarrassing way to go was watching Qui-Gon Jinn getting beat by a Sith Apprentice. So much for being a powerful Jedi Master...
Qui Gon was never a master, only a knight, due to his disobedience towards the council. Obi Wan points this out when he disargees with him about taking and training Anakin.
Most epic death in star wars; 'Freeze you Rebel Scum!' *is pelted with a box and screams like a girl while falling to his death.*
Made forever more epic by the fact that scream is saved and reused in literally every single movie since.