Ah, my lovely DGM was always like this. Always thinking about something else when out and about and then saying it out loud.
One time that sticks in my mind is a time she was in Co-op buying cigarettes, but was due to go on to the market afterwards to buy thermal underwear for her DH.
"Hiya love, can I have a packet of 20 Richmond thermals please" she says to the shop assistant while my DM and I wait at the side of the checkout for her.
The confused look on the poor cashiers face was a picture.
"Errr, sorry I've never heard of those before... Brenda, do we have anything called Richmond thermals?" she asks her colleague.
"Richmond thermals???" says Brenda
"eh??"
"Yeah, this lady has asked for 20 Richmond thernals"
"Never 'eard of 'em!"
The long queue behind her are also looking confused and irate. Everyone is wondering wtf Richmond thermals are and why its holding them up.
DGM is getting annoyed now "Yes! Richmond thermals! I'm in here every Friday for 'em. They're right behind you in the blue & gold box!"
Brenda and young cashier scour the shelves but cannot find a pack of 20 thermals in a blue & gold box.
"Sorry love, but there's nothing 'ere called Richmond thernals' Brenda breaks the news.
"Oh for christs sake! I can see them, right there behind you!" snaps DGM
DM and I are creased up in hysterics and can't even breathe. Eventually I manage to gather enough breath to advise the poor cashiers she means cigarettes.
DGM was so embarrassed she started going to the local offlicence for her fags 