The risk of over-the-counter meds: How many Tylenols have you taken today?

When you buy over-the-counter drugs, do you read the label carefully? Do you follow the instructions to the letter? If you have a few over-the-counter drugs, do you look at the ingredients to make sure you're not double dosing or taking contradicting meds? Or, do you give into your headache and just glance over the instructions of the 500-tablet bottle assumimg that the drugs are pretty safe since they were sold to you in such large quantities without a prescription?

I'd venture to guess that for most people, it's the latter.