Looking for 50th Anniversary t-shirt ideas

[amywma]

We're taking the whole family on a Disney cruise to celebrate my in-laws' 50th anniversary. I'd like to make t-shirts for everyone, but am having trouble coming up with the wording I'd like on them. I've seen tons of cute pictures, but am just having trouble coming up with the words. Something short and sweet would probably be best, if I have any hope of getting my hubby and FIL to wear it! Any ideas, all of you terribly creative people?

Thanks!!
Amy