Unknown title of an old sci-fi movie

Ok so this movie scene memory has rattled my brain for a very long time!! I’m 99% sure it wasn’t a dream.

The scene, a child around 8-10 years old is in the bathroom getting ready for bed. Brushing his teeth in the mirror. All of a sudden he see’s something falling from the sky in the reflection of the mirror. He then goes outside to investigate and finds a small purple alien in his garden tree.

The end lol.

Please, if anyone can help me with this I would really appreciate it! It’s sending me bonkers.

More than likely wrong, but it’ll get us started: