What uses have you found for old key cards from hotels, 'fake' credit cards you get in the mail etc.?

Question:Personally, I use the corners to smooth off my caulking jobs around the house, and they make great emergency ice scrapers.

Answers:
1. keep one of these cards at your sink: to scrape dried food from dishes, casserole dishes, to get between the tines of forks and other kitchen utinsils. .
2. to remove the labels from your prescription bottles before discarding,
3. to remove the price tags or other stickers from items.
4. to score cards that are home made, and then use it along the folded edge to get a nice clean crisp edge.
5. Sanitize each card and punch a hole in one corner and string on a bathtub plug type chain or a pastic loop that threads back in through the the opposite end, for small children to play with. Be sure to soften the edges with a fine emery board or fine sand paper aand sanitize before giving to a toddler.
6. to scratch off the scratch off lottery tickets.
7. remove snow and bugs from your car windows.
8. Book markers
9. between dishes to prevent scratching and sticking together.
10. remove gum and tar from surfaces.
11. place on the end of a roll of tape. You won't have to search for a lost end.
12. scrape off bird droppings

and really there are whole lot of uses for it but most of the time I use it to spread glue with it with one side cut with a pinking shear to make like a tooth to spread the glue evenly

My kids put them in the spokes on their bikes like we used to do with playing cards

I used to give them to my little daughter to put in her purse. she loved playing with them.