Have Access randomly pop a message box from an array of messages

I need some help with some vba script that pops a message box lets say 20 percent of the time from an array of messages at random

I can do the 20% by doing
If rnd() * 100 > 20 Then

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my problem is how to write that code that on 20% of occasions gives me a random expression from

expr1, expr2, expr3, expr4

thanks in advance
If rnd() * 100 > 20 Then

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damixaAsked:
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GrahamSkanRetiredCommented:
I think that you need to explain further.

How are the  variables in your hypothetical call (expr1, expr2, expr3, expr4) related to your difficulty?
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Dale FyeCommented:
I would start with:

If rnd() * 100 < 20 Then

If you only have 4 expressions, then I would embed a case statement inside that:

SELECT Case rnd() * 100
    Case <= 25
         msgbox "expr1"
    Case <= 50
          msgbox "expr2"
    Case <= 75
          msgbox "expr3"
    Else
           msgbox "expr4"
End Select

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If you have more than 4 expressions, I'd put them in a table with [ID] and [Expression] fields, and use a query to select the top expression.  The query would look like:

SELECT [Expression] FROM tbl_Expressions ORDER BY rnd([ID]) ASC

And you could simply get the random expression with:

DLOOKUP("Expression", "qry_RandomExpressions")
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