Not a night of observing goes by where I don't see at least one and often far more.
A time or two I have seen a quick flash appear as just a dot then fade. This after some thought seems reasonable if I had been looking right at something falling right down my line of sight. Because they generally come in at an angle this would tend to happen not straight up but at some angle that matches the part of it's trajectory where it finally burns up.
I don't think I have ever seen a really big visual one right in the eyepiece coming right at me. I bet they were small bits as there are huge amounts of those all the time I suspect. I am just thankful that if it was big that it had burned up prior to 'denting' my scope.
Oh and all that stuff up there is really 'appreciated' by astro-imagers who have to throw out exposures all the time because of junk and sats.