Still have a tape deck though rarely use it, and a few old ragga clashes and South London jungle pirate shows on cassette (rapidly oxidising). Soundclashes work best on tape, don't ask me why, they mostly sound dreadful on MP3. Also, I used to like those beeps at the start of commercially-produced cassettes (what was the point of them? some sort of anti-piracy measure? if so, how did it work?)
Another thing you could do with tapes is buy a load of cheap ones from Oxfam - Wham, Electric Youth, Level 42, all that - take them home, put sellotape over the tape heads, record you and your mates screaming obscenities and blowing kazoos, then take them back to a charity shop for the benefit of future unwary punters.
Our school had a load of old '70s language tapes in a cupboard, and me and a friend took them home to use as C90s. I had a whole tape full of punk songs and in between each track there'd be a snatch of some woman explaining how to say you were from Biarritz or listing off French names for vegetables.
But the most killer tape application - capturing weird shit on the radio.