Bob and Bobek

Bob and Bobek are two rabbits that live in a magician's hat.  They are the main characters from a popular cartoon series that first appeared on Czechoslovak television in 1979.

There have been eight series and the episodes have appeared on večerníček (night time children's TV program).

Bob is the bigger rabbit and often takes the parental role.  Bobek (bobby) is the smaller rabbit and takes the child role.  They are clever and often get in and out of trouble.

Vladimír Jiránek is a well-known artist and illustrator who authored the series.

Bob and Bobek were even the mascots of the 2015 World Hockey Championships.

Here's a video of their adventure Na Koncertě that I found out on YouTube.