So on a late night crowded train full of drinks from xmas parties. Fair enough.
So some guy comes and sits next to me and looks at me intently and says 'thank you'. I say 'I haven't done anything'. He gives me the most ridiculous look and raises his eyebrows and says ' not yet'. I say loudly'that's weird and not appreciated'
He ignores me then tries to squash me. What can I say to him?