In one of my first ever PFS sessions two years ago, a 4th level Alchemist went to Huge size with ludicrous bonuses and completely dominated the scenario.
When I asked the player and GM how it was possible, they both just insisted it was and brushed me off.
I've never seen this again in perhaps a hundred sessions.
Is such a thing even possible in PFS, possible for that level of character, or were there player-GM shenanigans going on at that table?