Carter Thicke will never forget his last moments with his late father, Alan Thicke.

Alan's 19-year-old son recently sat down exclusively with Et, opening up for the first time about the death of his beloved dad. Carter was playing hockey with his dad at the Pickwick Gardens ice skating rink in Burbank, California, on Dec. 13, when Alan collapsed at the rink. He later died at the hospital.

Carter says his father kept up his joking mood that day, even after the ambulance came to the rink to take him to the hospital. Carter confirms that Alan joked with the EMTs, gave him a thumbs-up sign and asked him to take a picture.

Watch: Alan Thicke's Wife Tanya on Heartfelt Memorial Service -- 'I Thank Everyone From the Bottom of My Heart'

"He asked me to take a picture of him in the stretcher and, you know, he's telling all the EMTs to smile and put the...