Reply #26: Try this:

[kiki]

(I suggested this to someone else here last week)

Find out what percentage of the population illegal immigrants make up in your area. Then ask your ma what her guess at the percentage is.

If she's anything like the general public in the UK (and from what you've said she may be even more ill-informed), her guess will be around 20 times higher than the actual figure. Might give her food for thought.