Try not to make stupid comments in front of the girlfriend's family
if they have no idea you are joking.

One example, is if you are all watching TV, say at her parents house, and an advert for a program called say, 'Strictly Kosher' comes on. Do not say, "Jews are a bit weird aren't they?". If you get a response from your girlfriend similar to say, "You can't say that!", do not say, "Well they are, look! Hitler had the right idea", even if you are joking, as her parents and grandparents may not realise this fact.
(Monkey the Chicken Twitter: death_stairs, Mon 11 Jul 2011, 14:16, 2 replies, latest was 14 years ago)

Phew that was close
I was planning on using "hitler had the right idea" as a conversation opener at an upcoming wine and cheese evening
( Ring Of Fire A petty, drooling belming butthurt retard., Mon 11 Jul 2011, 19:29, Reply)

dont go
A wine and cheese evening? if they cant get the order of a cheese and wine evening right, then yes. Hitler would be too good for them.
(robneymcplum spiced up his life on, Wed 13 Jul 2011, 16:42, Reply)