Stupid Comments

Don't you hate it when people make stupid comments. Almost everyone does at one time or another. You know the kind of comments that I mean, the ones that leave you shaking your head and wondering, does that person ever think before he/she opens his/her mouth?
I'll give you an example. A few years ago I was with a friend of mine and he accidentally locked his keys in the car. The following comments were really made, although it was years ago so I am not necessarily quoting verbatim....
We came back inside and he said that he accidentally locked his keys in the car, and a gentleman present said "Did you check to see if one or more of the doors are unlocked?" My friend through gritted teeth basically responded saying if one of the doors was unlocked the keys wouldn't be locked inside.
gentleman: maybe one of the windows is open?
my friend: again, if that were the case, we wouldn't be locked out.
gentleman: do you have a spare key in your wallet?
at this point I was shocked that my friend didn't kill the gentleman. His response although no longer as calm, was similar to the previous answer.... Would I be in here if I had a copy of the key in my wallet? Wouldn't I already be on my way home??
Now I know that the gentleman meant well, but seriously..... Thankfully he didn't top it off by saying, "well if you had a copy of the key in your wallet, you wouldn't be in this predicament"