1 Customs Officer: Och, aye. Welcome tae Glasgow. Passports. {translation: Greetings. Welcome to Glasgow. Passports.}
2 Adam: Say, there's a myth that Glaswegians are particularly angry and violent. What do you think about that?
3 Customs Officer: Hoo dare ye impugn the guid people o' this fine city!! {translation: How dare you impugn the good people of this fine city!!}
3 SFX: Malky!! {translation: Headbutt!!}
4 Adam: Ow... sorry. No insult intended.
4 Customs Officer: Awa' and bile yer heid. 'Tis nae a myth, ye bam!! {translation: You have a good think about what you've said. It's not a myth, you bounder.}

It's even a trope. And just look at that illustration of the trope. You don't mess with a member of Clan McDuck!

Also, from this TV Tropes page I learnt that apparently Shrek is Glaswegian.

Silly me, I just thought he was an ogre.