Home / Twisty / Doc I Keep Hearing Strange Voices In My Underpants! Birthday Card Doc I Keep Hearing Strange Voices In My Underpants! Birthday Card£3.49 Card Size: 5” x 7”. Blank Inside. Envelope Included. Funny Birthday Card. 6 in stock Doc I Keep Hearing Strange Voices In My Underpants! Birthday Card quantity Add to basket Related products Father’s Day Card For My Old Man Sit Back And Relax £3.49 Add to basket 50th Birthday Card Fully Qualified Grumpy Old Git £3.49 Add to basket All the A***holes He Hated In One Room Rude Birthday Card £3.49 Add to basket Breaking Wind Keeps People Two Metres Away Greetings Card £3.49 Add to basket