Make a temporary user for a duration for a controlled environment!
TempUser allows you to create a temporary phone user for a duration in minutes. You can use this to test certain applications that may look suspicious in a controlled environment. Give it to a friend to download some games for a while and have them be deleted later.
TempUser is better than a guest account because the user does not contain any personal information at all, unlike android's stock guest user. A friend can sign into a new Google account to download apps!