In live-action games, all the time.
In tabletop, not so much. But, there are a few things...
When running Deadlands, my Fate Chip pot is a cowboy hat.
When playing in a campaign tabletop game, I often try to identify some beverage (often some form of tea) that I associate with the character. Not that the character drinks the beverage in-game, but that I drink when playing.
This habit started when I was playing a half-orc fighter/cleric, and I wanted to use a really deep voice for him in game. I found it easier to do if I drank hot tea before and during the session. I had a favorite tea that was a little expensive for me at the time, so I reserved it for game days.