Oh. I was thinking of some glass piece someone has drop or throw away, and I was wondering why we are talking about writing names and smilies in those? LOL
Stupid me. I should have remember the meaning of "condensator"...
When I was kid I used to write in fogged bus windowses etc., usually left my name letters "JK" with fancy font

Common things I write into condensed windowses are "=)" smilies, Super Mario items that have eyes, like Starman and Super Mushroom, or hearts.
Sometimes I leave trio of Cross, Anchor and Heart (Faith, Hope & Love)
I can remember the time I had bought my PlayStation One and I was kinda brainwashed by Sony and I drew PS button characters, X, O, Square and Triangle in foggy windowses. lol
It's also fun to write into muddy/dusty car windowses.
I'm in horticultural/agricultural college (gardening & farming) and you guess our transport vans have often dusty rear windows and I keep writing "JMPOL" (our school for shorter) and sentences like "Gardener-in-Training Behind the Wheel" and "Barnschool Battletank" in those xD
(Our school is known as "Barnschool" by local youth as we have agriculture course)
edit: fixing typos