The train that thinks it’s a plane seems to have a sense of humour. Putting to one side Eurostar’s once unenviable reputation for tardiness and forgetting momentarily Eurostar’s legacy-airline pricing model (no affordable one-way tickets, a maximum return price of €760 for a journey of less than three hours), one can’t help being impressed by this touch of humour on the company’s website (my emphasis):

Tickets
To check in, all you have to do is insert your ticket into the machine (which will hold onto it exactly long enough for you to start to panic, just a little bit) and then walk through the gate with your baggage. Easy. If you need help, our staff are always around, and we’ll be glad to check you in ourselves.

When To Check In
This depends mainly on what ticket you have. Unless you’ve been advised otherwise, please check-in at least a 30 minutes before your scheduled departure. Below are the full details, just bear in mind that if in doubt, arrive with time to spare. And have a croissant.
Link to original

Not only is this refreshingly lighthearted, but it’s present in the other languages available on the Eurostar site as well:

Il vous suffit d’insérer votre billet dans la machine (qui ne vous le rendra qu’aprés avoir observé chez vous un début de panique et un premier geste d’appel au secours en direction de notre personnel d’accueil”)
[…]
En cas de doute, prévoyez large et arrivez en avance. Et savourez un bon croissant.

Om in te checken hoeft u alleen biljet in de machine te steken (die het net lang genoeg zal behouden om u een beetje zenuwachtig te maken)
[…]
Hieronder vindt u alle details, maar denk eraan dat in geval van twijfel het beter is te vroeg te komen. En een croissant te verorberen.

Consistency in translation (where culturally appropriate) is second only to godliness and a good millefeuille.

-DM