"The issue is, if you search for just [do a] in Google with Google Instant on, it will show you the search results for [do a barrel roll] and just spin the screen before you can complete your query. So if you meant to search for [do a hop skip and a jump], good luck because before you know it, the search results will take an unexpected turn," reports Search Engine Roundtable.
Actually, you can continue entering the query and the Easter Egg will disappear, but few people will do that. This is an example of Easter Egg that disrupts the user experience and makes Google Search more difficult to use.
Google could trigger the Easter Egg only if you type the entire query or if you select the first suggestion. Another option is to delay the Easter Egg animation.