You know you've played too much Lucasarts when your thought process for opening a can goes like this:
Look at -> Can
"Looks like a can of beans."
Open -> Can
"Nope."
Use -> Can -> Use Can with -> Rhinoceros lips
"I don't think that will work."
Give -> Can -> Give Can to -> Cat
"I don't want to give her that."
Use -> Can opener -> Use Can opener with -> Cat
"Hmmm... no."
And you interact with everything in the kitchen before you work it out.
Alternatively, you know you've played too much Fallout when you're looking for Ink Spots songs at Karaoke night.
You know you've played too much Viva Pinata when you make two squirrels run through a maze of bombs and have a sexy dance to get a baby squirrel, impatiently wait for the squirrel egg to appear and then smash them both to death with a spade when nothing happens. And then search in the entrails for sweets.